While you are browsing some online stores, you might notice that they recognize you and this happened regardless of whether or not you logged into their site. For example, the website remembers the last few items you viewed or the recent keyword search you wrote.

Another example is that some of the pop advertising is about an item or brand that you have searched about before

Can you explain how this works behind the browser or from the server side?

A- explain How it works?

B- what Methods are used?

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