What is SUI? Sui is a smart contract platform maintained by a permissionless set of validators that play a role similar to validators or miners in other blockchain systems.

Sui token Sui has a native token called SUI, with a fixed supply. The SUI token is used to pay for gas, and users can stake their SUI tokens with validators in a Delegated Proof-of-Stake model within an epoch.

Sui Transactions A transaction in Sui is a change to the blockchain. This may be a simple transaction affecting only single-owner, single-address objects, such as minting an NFT or transferring an NFT or a different token. 

Sui concepts 1. Objects 2. Transactions 3. Validators

Objects Sui has programmable objects created and managed by Move packages. Move packages themselves are also objects. Thus, Sui objects can be partitioned into two categories: mutable data values and immutable packages.

Transactions All updates to the Sui ledger happen via a transaction. This section describes the transaction types supported by Sui and explains how their execution changes the ledger.

Validators  The Sui network is operated by a set of independent validators, each running its own instance of the Sui software on a separate machine (or a cluster of machines operated by the same entity).