The idea
Certifunny stands for "Certify" + "Funny" or in other words: "Funny certificates".
For better understanding of what it is, we should look at its motto:

So, pretty much, this is it! Simple right? You say you are an astronaut? You get your certificate! We have no reasons not to believe you.
The mission
The mission statement of Certifunny is the following:
"To make people happy and proud.
To motivate them reach a goal or serve a good cause".
Certifunny came to offer you all those certificates that you wished for but couldn't get. There is no need to spend endless nights studying dinosaurology, trying hard to prove you are a dinosaur. It is obvious Rex, it is pretty clear. Isn't it?
Certificates made easy now!