A Tumblr account is a user profile on Tumblr, which is a microblogging and social networking platform. With a Tumblr account, you can:
Create blogs (personal or themed)
Post multimedia content like text, photos, GIFs, quotes, links, audio, and video
Follow other users and see their posts on your dashboard
Like, reblog, and comment on posts
Customize the look of your blog(s) with themes and HTML/CSS
Each account can have multiple blogs:
Primary blog (your main one tied to your username)
Secondary blogs, which can be collaborative or private