what is origin in git remote code example

Example 1: git check upstream url

git remote show origin

Example 2: git add remote

git remote add heroku https://git.heroku.com/arrecs.git
git remote -v
-> heroku	https://git.heroku.com/arrecs.git (fetch)
-> heroku	https://git.heroku.com/arrecs.git (push)

git remote remove heroku
git remote -v