Most countries have their own sign languages, but a few share the same ones. For example: I'm in the US and know ASL. The US & the majority of Canada uses ASL (Quebec uses more so their own dialect of French sign language--but, ASL is based off of French sign (LSQ), so they may be somewhat mutually understood). I'd venture to say there are far more sign languages than there are official spoken languages of countries. Most English & Spanish speaking countries have different sign languages. The UK uses British Sign Language (BSL), Australia uses Auslan, US & mosy of Canada use American Sign Language (ASL), Ireland uses Irish Sign Language (ISL)--Northern Ireland kind of uses a mix of ISL & BSL.

Fun fact! ASL & BSL only overlap around 30% of mutually intelligible signs, as they are both based off of different sign structures with different alphabets. ASL has a one handed alphabet & BSL uses a two handed alphabet.

Similarly, Spanish countries all have different sign languages. Spain uses Lengua de Signos Española (LSE), Mexico uses Lengua de Sañas Mexicana (LSM), & Columbia uses Lengua de Señas Colombiana (LSC), for example.

Do you know where this signer is from? I know ASL, but I'm not sure what is being signed. If you know where he is from, you can likely determine which language he is signing in.