Thank you very much for your vote! It is important that you (and everyone) understands what witnesses do and why it's important to vote for them. Rather than try to explain it here I'll refer you to this great post by one of the top witnesses, @timcliff, which includes links to a number of resources to explain everything you could want to know about witnesses:
https://steemit.com/witness-category/@timcliff/witness-voting-guide
If you still have any questions feel free to ask here or contact me in steemit.chat!
Cool, thank you so much, will read and if I have any doubts, will let you know! :)