What is op on reddit?

"OP" on Reddit stands for "Original Poster". This term refers to the person who made the initial post or thread on the website. The OP is typically the individual who starts a conversation, shares an article or image, asks a question, or contributes content to a subreddit. Users can identify the OP by the username listed at the top of the post. OPs are often encouraged to engage with other users in the comments section and provide additional information or context related to their original post.