What is what does it mean when it says active today on instagram?

When Instagram shows "Active Today" under a user's name, it signifies that they have been actively using the app sometime within the last 24 hours. It doesn't pinpoint the exact time, but rather indicates that they have opened the app and potentially interacted with content, posted stories, or sent direct messages during that period. This is different from "Active Now", which implies they are currently online. So, "Active Today" is a broader indication of recent activity. The specific type of activity they engaged in remains private.