Script live active start to end

Hello everyone
May be this question is asked several time on forum but i could not find in search.
I am new to unity and learning at this time. I did lot of work in Shiva 3D but now also want to try unity.
In Shiva 3d there are two type of scripts. User script and object script. User script is available from start to end the game and object script is only available in object life.
Please could you tell me is Unity has script which is available(its variable and functions etc) from start to end. I know how to create script for objects. but dont know about user script in unity.
Thanks a lot:smile:

You can create an empty object and make it don’t destroy on load so it lives from start to end:

This is commonly done for like a game manager.

Thanks a lot.:smile: