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How do Mars rovers send data back to Earth? Do they have some kind of built in WI-FI routers or is there any other connection?

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    $\begingroup$ "How do Mars rovers send data back to Earth?" can be answered by looking through this site. Even requiring three tags gets enough answers to answer this. communication + mars + rovers $\endgroup$
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Generally what happens is that radio signals are sent from the Martian surface to a spacecraft orbiting Mars, which then sends the data to Earth.

As an example, the current NASA missions on the Martian surface (Perseverance, Curiosity, and InSight) send data via radio signals to the Mars Relay Network, which consists of various NASA and ESA Martian orbiters. This network then relays the radio signals to Earth that is picked up by a network of three radio antenna facilities known as the NASA Deep Space Network.

Update: Directly sending a radio signal to Earth from a Mars rover is also possible through a High Gain Antenna, albeit at a lower data rate (ex. Curiosity and Perseverance).

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