A reblog is a little green arrow button on a post where you are able to share the post, help circulate the post, and help the author of the post feel abject terror and/or pure joy.
It kind of like sharing a cool rock you found.
Because tumblr doesn’t have an algorithm in the same way that other social media sites do, reblogs are the main way that the post stay alive and circulating. They are how tumblr keeps running.
Some people do a lot of reblogs, some people only do a few here and there. Then there’s me, who has a massive rock pile of pebbles that I bury people in to show them my cool rocks π
Hope this makes sense! Let me know if you have any other questions :)
I forgot, it’s not always green, it’s this button: