History and Evolution of Web Advertising: The Path to Data-Driven Marketing

The Evolution of Digital Marketing and Modern Challenges

Creation Date: April 2, 2025

Author: Intimate Merger, Inc.

Version: 1.0

Web advertising has a history spanning approximately 30 years since its inception and has undergone dramatic changes alongside technological advancements. From simple early banner ads to sophisticated, AI-powered personalized ad delivery systems, its evolution continues to accelerate.

This document explains the overall picture of digital marketing chronologically, from the historical background of web advertising to contemporary challenges. It particularly focuses on the rise of data-driven marketing and the impact of privacy regulations, exploring the future direction of digital marketing strategies.

Changes in Web Ad Click-Through Rates (1994-Present)

0% 10% 20% 30% 40% 50% 1994 2000 2005 2010 2015 2020 2025 44% 0.7% Trend of Average Web Ad Click-Through Rates Year Click-Through Rate (%)

Early web ads recorded a high click-through rate of 44% due to their novelty, but this has now dropped to around 0.7%.

Eras of Web Advertising

1990s: The Birth of Banner Ads

The world's first web banner ad appeared, marking the beginning of internet advertising history. Ads during this period primarily served a role similar to billboards, and measurement was limited.

  • Placed horizontal image files at the top of web pages
  • Initial CTR was extremely high at about 44%
  • Mainstream model was "space selling" based on placement period and location
Early 2000s: Rise of Search Engine Marketing (SEM) and SMM

Search Engine Marketing (SEM), represented by Google AdWords, emerged, enabling keyword-based ad delivery. Additionally, social media platforms like Facebook and Twitter were born, leading to the spread of Social Media Marketing (SMM).

  • 2000: Google AdWords launched
  • 2004: Facebook founded
  • 2008: Twitter launched
  • Importance of SEO (Search Engine Optimization) increased
Late 2000s: Emergence of Programmatic Advertising

After the Lehman Shock, financial engineers moved into the digital advertising industry, leading to the concept of programmatic advertising. Automated ad trading systems like RTB (Real-Time Bidding), similar to stock trading, became practical.

  • Ad space trading automated like stock trading
  • Pricing based on supply and demand between advertisers and publishers
  • Around 2010: Emergence of DMPs (Data Management Platforms)
2010s: Evolution of Data-Driven Marketing

Data-driven targeted advertising became mainstream, advancing personalization based on user interests. Ad optimization using AI also became widespread.

  • Targeting based on web Browse history
  • Automated optimization for efficient budget allocation
  • Automation of the PDCA cycle using AI
2020s: Arrival of the Post-Cookie Era

Due to stricter privacy regulations, the use of third-party cookies became increasingly restricted, ushering in an era requiring new data utilization methods.

  • Enforcement of GDPR (EU General Data Protection Regulation)
  • Enforcement of CCPA (California Consumer Privacy Act)
  • Google's announcement of phasing out third-party cookies
  • Search for new privacy-conscious ID technologies

Evolution of Ad Technology

Evolution of the Digital Advertising Ecosystem 1990s Early 2000s Late 2000s 2010s-2020s Banner Ads Billboard Role Space Selling Focus Measurement Clicks Impressions SEM Google AdWords Keyword Bidding SEO Search Engine Opt. SMM Facebook (2004) Twitter (2008) RTB Real-Time Bidding Ad Trading Auto. DSP/SSP Demand-Side Plat. Supply-Side Plat. DMP Data Mgt. Platform Advanced Targeting Data-Driven Behavioral Targeting Personalization AI Optimization Automated Bidding PDCA Automation Privacy Regulations GDPR/CCPA Cookieless Solutions New ID Tech First-Party Data Privacy-Preserving IDs

What is Programmatic Advertising?

Programmatic advertising is technology that automates ad space trading and enables optimal ad delivery in real time. Developed by engineers who moved from the financial industry after the Lehman Shock, it applies systems similar to stock trading to the advertising industry.

Features:

  • Real-time bidding per ad impression
  • Pricing based on supply and demand
  • Efficient matching between advertisers and publishers

DMP (Data Management Platform)

A DMP is a data management platform designed to increase the efficiency of ad delivery. It collects and analyzes user interests and behavior history to optimize ad distribution.

Roles:

  • Data collection (e.g., web access history)
  • Analysis of user interests
  • Provision of effective targeting information
  • Increasing value for both advertisers and publishers

Ad Ecosystem Components

The modern ad ecosystem consists of multiple specialized platforms.

Key Components:

  • DSP (Demand-Side Platform): Advertiser-side bidding and delivery platform
  • SSP (Supply-Side Platform): Publisher-side ad space sales platform
  • DMP (Data Management Platform): Data management and analysis
  • Ad Exchange: Marketplace for ad inventory

Challenges and Outlook in the Post-Cookie Era

Background of Privacy Regulations

The recent strengthening of privacy regulations stems not only from technical concerns but also from social, political, and economic factors.

Key Events:

  • Cambridge Analytica Scandal (2018): Data collection and use for election campaigns raised concerns about influencing political decision-making.
  • Trade Friction and Tax Revenue Issues: Particularly in Europe, taxation issues related to profits earned by US platform companies from local data use contributed to the background of GDPR enactment.
  • Information Sharing Among Financial Institutions: Issues concerning the sharing and use of customer information in the financial industry became a distant cause for enacting personal information protection laws.

Comparison of Major Privacy Regulations

Regulation Name Region Effective Year Key Regulations Impact on Ad Industry
GDPR
(General Data Protection Regulation)
EU 2018 Legal basis for processing personal data, consent requirements, data portability rights, etc. Obligation to obtain explicit consent, restrictions on cookie usage
CCPA
(California Consumer Privacy Act)
California 2020 Notification obligations regarding collection, use, and sharing of personal information, right to opt-out Increased transparency in data collection, implementation of opt-out functionality
Browser Cookie Policies Worldwide 2023-2025 Phased elimination of third-party cookies Reevaluation of traditional targeting methods, development of alternative technologies

Strategies for the Post-Cookie Era

To address the limitations on third-party cookie use, new directions in digital marketing are being explored.

Key Strategies:

  • Enhanced utilization of first-party data
  • Shift towards contextual advertising
  • Development of new privacy-conscious ID technologies
  • Emphasis on building direct relationships with users

The Future of Data-Driven Marketing

Despite the changing regulatory environment, the importance of data is increasing. Data utilization through more transparent methods is required.

Future Directions:

  • Further evolution of AI-driven data optimization
  • Penetration of the Privacy by Design concept
  • Balancing customer experience improvement and advertising effectiveness
  • Pursuit of balance between privacy and ad effectiveness

Summary

Over approximately 30 years, web advertising has evolved from simple banner ads to sophisticated data-driven marketing. This evolution has been significantly influenced not only by technological advancements but also by social, political, and economic factors.

We currently stand at a new turning point: the Post-Cookie Era. Stricter privacy regulations are forcing a reevaluation of traditional data utilization methods, but this also presents an opportunity for new innovation.

Future digital marketing will likely involve utilizing data more transparently while balancing consideration for privacy and marketing effectiveness. Building trust with users and providing value will become increasingly important in this context.