The very names contextual advertising and targeting advertising appeared long before our search and social networks became what we know them now. So the differences that used to be significant will not seem so strong anymore. Previously, contextual advertising was showing mostly in search, and mainly based on a user's search query, then there appeared networks in contextual advertising systems, and in their display was already taking not into account only the search query, but taking content. Targeted advertising was born out of social networks where people used to get together in different groups based on their interests or preferences, it was possible to create segments of different social network users and let advertisers show advertising messages to different categories of people. It used to be just pictures and text, but there are many more formats now. The word targeting itself is from the word target targeting, meaning to target a specific audience. But now these boundaries are conditional and blurred. There are advertising systems Google, Facebook. These are all systems of different big platforms, and principles of display in them often occur similar. So, according keywords can be adjusted advertising systems Google adjust to segments of users. The names became more historical, contextual advertising is advertising, which appeared thanks to the search engines, and targeting - thanks to social networks. Contextual advertising is basically advertising in Google, and targeting advertising network is basically Facebook (FB + Instagram)