We could explain it all to you with some fancy metaphors and whatnot, but the truth is it’s far easier to just create a Tumblr account and experience it for yourself.
Head over to the site at Tumblr.com, create an account, pick a theme and dive in.
By default, Tumblr handles seven different types of posts — links, conversations, photos, quotes, audio clips, videos and of course a “traditional” text-only blog post. Each type of content gets its own input screen, and each of these input screens has its own icon in the Tumblr dashboard.