In addition to making your search results more relevant, you're Google "web history" can make for a handy, fascinating, and/or creepy way from tracking what you'v searching on and for the past days, weeks, months, and even years.
In addition to making your search results more relevant, your Google "web history" can make for a handy, fascinating, and/or creepy way of tracking what you've been searching on over the past days, weeks, months, and even years.