Gatwick is London’s second airport. It’s to the south, about 30 miles away, on the route to Brighton. As it is so far out, it’s not on the underground and black cabs don’t go that far, normally at least, so options are limited.
There are two terminals, North and South. There is a free shuttle that runs between the two and takes just a few minutes.
Gatwick is much smaller than Heathrow and it is easier to get around.