# What are Collections? ## Collections Overview Collections are smart contracts on the blockchain that allow you to create new NFTs.

You need to create at least one collection to start minting NFTs

## Creating and Organizing Collections When you have a collection, you can create as many NFTs as you want using the same contract.\ \ When you create a new NFT under a specific collection on BirthMark, it will be saved and displayed with other NFTs that were also created within the same collection.

Artists on BirthMark can create various collections to organize and display their tattoo NFTs in their portfolio.

{% hint style="info" %} **Tip:** If you want to avoid paying gas fees for multiple collections, create only one collection with your name and mint all your NFTs from that collection. {% endhint %} {% hint style="info" %} **Tip:** If you want to group your tattoos under multiple collections according to their style, date, trends, colors etc., create a collection for each category. That way, you can give different names, symbols and descriptions to those collections and set their royalty rates individually.\
{% endhint %}