Over the past years, the history of online advertising is increasingly becoming more and more interesting. Being the most effective media platform between business owners and customers, online advertising has in recent times established itself as the most efficient and the fastest medium for business advertisement. In fact, it is now the most essential vehicle of any successful business. Briefly tracing back the history of online advertising in an amiable understanding, it all began in the year 1994 when the first online advertisement was followed by a time of experimentation on advertiser and publisher advert formats and technology. This brought about the first ad technology in 1995, the DoubleClick. However, advertisers as at this time were well aware of the vast differences between traditional systems of advertisement and online advertising; as a result, they undertook a target market research. Few years after, the internet was utilized as an out-and-out vehicle for effective advertising. Today, online advertising has steadily risen and top the chart of every business advertising medium. From social media, blogs and SEO marketing to interactive tools, branding technologies and sophisticated ads, advertisers are using different platforms to enhance business visibility. The history of online advertising is now what everyone wants to know.