NFTs are all unique tokens and inherently proof of ownership. There are limitless use cases that you if the setup is right. You can use them as tickets for sporting events, concerts or any event that requires you to hold a unique item to trade for an entry.
NFTs are commonly used today for trading digital artworks. The full potential is yet to be unlocked. NFTs can serve as a tool for licensing, ownership, security, identification, etc. For example, on AllianceBlocks Fundrs, users can mint NFTs that represent their Gold, Silver, and Bronze membership tiers.