A follower is a term used to describe a person who is following another person on the social networking site Twitter.

followers is someone can follow you in twitter, instagram that's called followers

If you're talking about Twitter, as I assume, then you have been answered already. But the term can be used in other contexts too.

What is Followers?
 

On the Twitter Web site "following" someone means you will see their tweets (Twitter updates) in your personal timeline. Twitter lets you see who you follow and also who is following you. Followers are people who receive other people's Twitter updates.

Same for all websites which giving you option to follow.

A follower is a term used to describe a person who is following another person on the social networking site Twitter. Every Twitter profile page has Following
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There are 2 types of followers real and fake. The real one which follow you inspired by your work and other are fake one ;)

A person who follow you and your website is known as follower.

Your post is good and simple. We receive many followers in our social media only when if our page or articles are impressive to some others.

A follower is a term used to describe a person who is following another person on the social networking site Twitter.

They followers are here

The person that follows you,

amazing information, is the nice

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On Twitter, blogs, and other social media sites, a follower is someone who subscribes to receives your updates.

Instagram has good followers.