Answer:
Cookies
Step-by-step explanation:
Cookies are pieces of information stored as text strings on your computer.
A web server sends you a cookie and a web browser stores it. The browser then returns the cookie to the server the next time the page is referenced. One of the most common uses of cookies is to store user ID. For example, the cookie might contain the following ID = 456894.
An example of a website that uses a cookie is an e-commerce website. When you visit the site and fill out a form, the website assigns you a user ID, stores your information with this user ID in the database on the web server and then returns this ID to your browser as a cookie.
The next time you visit the page, the browser sends this ID to the server. The server looks up this ID and then customizes the page it sends back to you. For example, you might see on the page, "Welcome back, David!"