Google CEO Sundar Pichai: "Our goal is build a personal Google for each and every user."

It's interesting to see personalized search and search-as-a-dialogue coming back again. There's a long history here, including from Google, some of which I'll link to below. The key idea is that a search engine shouldn't just use your current query, but everything it knows about you, including where you are, what you and others like you tend to be interested in, and what you just did to disambiguate your intent and help you find what you actually need.

Other than navigation queries, most queries lack enough information in one or two keywords to really know what you want. If a search engine/app/bot/device knows you and others well, it can fill in that missing information, and help you get where you want to go faster and more easily.

I'm glad this is is coming back now. It's a great direction. Here's some links to some of the older work from a decade ago or so on this, still relevant today:

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