okay so i burnt out my corner lights and tailights and all that other good stuff so i removed the fuse the one under the A/T fuse but after doing this i forgot to replace the A/T fuse

so 2 quick questions
1) what exactly is the fuse for
2) how come i got a CEL light on now didnt check it yet i will do this later just wanted to know how come it would trigger this too happen

 

oh ya i drove it to move it not too far and then realized the fuse was missing so then i went ahead and replace it right after i did that