a person who keeps and updates a blog
"After reading her latest post about travel tips, it's clear that she is an experienced blogger who knows exactly what her readers want to see."
A contributor to a blog (from weblog) or online journal.
"The tech blogger shared her latest review of the new smartphone on her weekly column."
In plain English: A blogger is someone who regularly writes their own stories and opinions on a website for other people to read.
"My friend became a popular blogger after she started sharing her travel photos online."
Usage: A blogger is a person who regularly writes entries on a blog, which functions as an online journal or website. Use this term to describe anyone maintaining such a site, whether they do it professionally or as a hobby.
The word blogger is formed by adding the suffix -er to the noun blog. It was coined to describe a person who regularly writes on an online journal or website known as a blog.