Question ISAE 3402 Certification

[JeJeB]

Hey guys, can someone explain to me what exactly this ISAE 3402 certification does? Is it even worth it for a small IT company? We received an inquiry for a big tender and it is a requirement. Can you buy the certificate somewhere?

 

[USAFRet]

Hey guys, can someone explain to me what exactly this ISAE 3402 certification does? Is it even worth it for a small IT company? We received an inquiry for a big tender and it is a requirement. Can you buy the certificate somewhere?

What is unclear about this Wiki entry?
https://en.wikipedia.org/wiki/ISAE_3402