Are taxis available at the airport?

yes... available

Most airports do have taxi stands outside.

At most airports they're available right outside the exit...

Yes - they stand outside.

Even the Math section isn't immune to ignorant trolls.

yes......................................

yes......but in bangladesh

Nope, no taxis there. If you want to find a taxi, you need to go out on a lonely highway somewhere.

They’re waiting for you as soon as you step outside. Most hotels have complementary taxis that drives people to and from the airport.

Have you ever been to an airport? Taxis are all over the place. The exception would be smaller airports. In that case, you might need to call for a taxi.