It's often used when:
* Giving someone an item: "Here you go, your coffee."
* Completing a task: "Here you go, I finished the report."
* Offering information: "Here you go, the website address you requested."
It's a friendly and informal way to hand something over.
Here are some synonyms for "Here you go":
* Here you are
* There you go
* You got it
* Here's your
* There's your
Example:
"Can I have the remote?"
"Here you go!"