The document discusses the evolution of online search from the early search engines of the 1990s like AltaVista and Yahoo to today's dominant player Google. It outlines the primary types of online marketing and details how search has expanded from just web results to include images, maps, local information, shopping, video, social media, and paid search listings. Key developments that improved search results over time include Google's PageRank algorithm, faster servers, increased competition between search engines, and important new features and content types added to search.