# Reactions

Users [react](https://docs.rara.social/protocol-features/react) to curate NFTs. Spending reactions enables users to add comments and tags to an NFT, too. Reaction can be used as: 

* Web3 emojis, likes, GIFs, and memes;
* Filters for Photo NFTs; and
* In-Game Consumables.

<figure><img src="https://649352923-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fg1ALwzq64rcdnV8nMWhu%2Fuploads%2Ftsx8GOdgj3q35BKN125S%2FReactions.png?alt=media&#x26;token=5809b478-b758-4fda-a85c-16c80e0b05bf" alt=""><figcaption><p>Web2 to Web3</p></figcaption></figure>

Reactions are one-time use ERC-1155 tokens generated by the registered NFT’s media. Anyone can [register](https://docs.rara.social/major-concepts/registration) an NFT they own as a reaction. We call these users "Makers".&#x20;

Once a reaction is registered, anyone can use it to curate an NFT via [react](https://docs.rara.social/protocol-features/react). We call these users "Curators". Every time you react to an NFT, a free [RA! Like Token](https://docs.rara.social/major-concepts/broken-reference) is generated.&#x20;

All curation and RA! like tokens are free! Transaction costs are generally only 1-2 cents in $MATIC.