This study discusses the evolving trends in online advertising, diverse marketing models, and changing user needs. From the early development of the Internet, especially in the early 1990s, to the emergence of numerous advertising formats, online advertising has become an integral part of modern marketing. Different types of online advertisements, such as banner ads, pop-up ads, video ads, native ads, search engine ads, and social media ads, fulfill different needs of advertisers. In addition, the study also explores diverse marketing models for online advertising, including pay-per-click, pay-per-thousand-displays, pay-per-action, affiliate marketing, targeted ads, and video ads, which provide more choices for advertisers. In terms of user characteristics and needs, as technology continues to evolve, user reliance on mobile devices increases, the use of ad-blocking and anti-advertising technologies rises, concerns about data privacy increase, social media becomes an important channel for advertising, and data analytics and ad-tracking technologies become increasingly critical. A user’s age, gender, geographic location, interests, purchase history, device and platform, social interactions, and privacy preferences are important in creating user profiles and target market analysis. In summary, online advertising plays a key role in the modern marketplace, providing advertisers with global advertising opportunities and the need to continually adapt to market and technological changes to maximize ad effectiveness.