I've noticed that when I am reading about something online, and I open a new tab to google something was I reading about, whatever I had in mind comes up almost immediately in the suggestions.
For example, I was looking up the soundtrack to a tv episode. I was interested in one of the songs, so I opened up YouTube and started to search it. All I typed in was the first letter, and the song name was already at the top of the search suggestions. And this is an old, obscure song.
The only conclusion I can draw is that Google reads the text of web pages you have open, and uses that information to improve any near-future searches. Am I right? If so, what is this feature called?