To repost on Instagram means to publicly share someone else's public reel or post directly to your own feed. When you repost, the content appears in your followers' feeds and is also collected in a dedicated "Reposts" tab on your profile. This process gives credit to the original creator by keeping their username visible and linking back to the original post, which helps expand the content's reach to new audiences. Reposting allows users to share interesting, educational, or entertaining content easily while helping creators gain more exposure organically, without paid promotion. It is a built-in feature on Instagram, distinct from sharing to stories or via messages, and is similar to retweeting on Twitter.
