What is Unity's language?

I just finished learning some of the basic programming languages, (JavaScript, HTML & CSS, C++ and C#) and I wanted to start programming with unity. I searched google and youtube but found no answer to my question… do you know what programming language unity uses?

thanks and have a nice day!

Please refer to Google before posting your question, please.

Unity3D’s scripting system uses a modified version of JavaScript, called UnityScript, and also uses C#. You can choose to use either one or both.

Note: No one has ever “finished” learning programming.