# Token Standards

A token in every blockchain ecosystem function as the central element of a new economy and ecosystem. The standard of a particular token defines a set of rules that governs its utility and issuance. SRC tokens (Slice Request for Comments), which is a technical standard used for smart contracts, such as SRC20, SRC721 on the SliceLedger are the example of token standards.

### **Token standards on SliceLedger Chain**

**SliceLedger** chain introduces two types of token standards with its own unique function including SRC -20 and SRC -721. Both this token standards can be divided into separate categories as fungible tokens (SRC 20) and non-fungible tokens (SRC 721). 

Fungible tokens are all equal, divisible and interchangeable. It all can be divided into smaller token units such as 0.1 SLICE , 0.002 SLICE . Whereas non-fungible tokens (NFTs) are all distinct and non-divisible. Thus it could represent a unique asset, like a certificate or a collectible in-game item. 

{% content-ref url="token-standards/slice-20-tokens" %}
[slice-20-tokens](https://slice-ledger.gitbook.io/sliceledger/developer-guide/token-standards/slice-20-tokens)
{% endcontent-ref %}

{% content-ref url="token-standards/slice-721-tokens" %}
[slice-721-tokens](https://slice-ledger.gitbook.io/sliceledger/developer-guide/token-standards/slice-721-tokens)
{% endcontent-ref %}