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Every account on Mastodon and the Fediverse has a unique account address, it will look something like this:

@ (username) @ (server)

You can find anyone's address by looking at their profile page, the address is written underneath their display name in a smaller font.

Account addresses are handy if you want to tell people about your account, people can paste your account address into the search box on their server which will make your profile appear.

Lots more info at https://fedi.tips/whats-my-accounts-address-how-do-i-follow-other-peoples-addresses-how-can-people-follow-my-address/