Instagram, TikTok and X allow a limited number of links on your profile. A link-in-bio page sits behind that one link and lists everything else you want people to reach.
You can add link buttons, social icons, YouTube and Spotify embeds, a contact form, a newsletter signup, a vCard, a PayPal button and more.
Each button is measured separately, so you can see what your audience actually cares about. Which piece of content is pulling its weight stops being guesswork.