NFTs (non-fungible tokens) are unique, each one can have a different value and are irreplaceable. What makes NFTs special are that they enable the tokenization of individual assets. They can often be found in games or you can imagine them as digital pieces of art, music… basically anything you like. Unique tokens can be further modified adding new “tools”, hence increasing their value overtime (like new parts on a racing car).
The popularity of NFTs have also spawned a whole industry, with companies creating products to help utilise the full potential of NFTs such as marketplaces, and tools to create your own NFTs and ensure its authenticity.