What is a powerserey. ....?

 is the strength or power of the account that we have, if we have a lot of power, of course the value of upvote that we give to a post will certainly be high or increase and if our steempower is low, of course the upvote value that we give will be low too. And where do we get steempower? Steempower we get from our own posts and from giving comments on a person's post, if there are many people who give upvote our posts and our comments, that's where we get steempower benefits (account power).