# Protocol Participants In Selenium Protocol, users act in one or more of the following roles: * Trader * Minter * Liquidity Provider * Staker ### Trader A **trader** engages in buying and selling Selenized Assets against approved collaterals through [Terraport](https://terraport.finance) and benefits from price exposure and arbitrage opportunities. ### Minter A **minter** is a user that enters into a **collateralized debt position** (**CDP**) in order to obtain newly minted token of a Selenized asset. **CDPs** can accept collateral in the form of **LUNC**, **Selenized assets**, or any **whitelisted collateral** and must maintain a collateral ratio above the Selenized asset's minimum multiplied by a premium rate for each collateral type (set by **governance**). Excess collateral can be **withdrawn** as long as the CDP's collateral ratio remains above the **minimum**. Minters can adjust the CDP's collateral ratio by burning Selenized asset or depositing more collateral. ### Liquidity Provider A **liquidity provider** adds equal amounts of a **Selenized asset** and **LUNC** to the corresponding [Terraport](https://terraport.finance/trade) pool, which increases liquidity for that market. This process rewards the liquidity provider newly minted **LP tokens**, which represent the liquidity provider's share in the pool and also provide rewards from the pool's trading fees. LP tokens can be burned to reclaim the share of Selenized asset and LUNC from the pool. ### Staker A **staker** is a user that stakes either LP tokens (with the Staking Contract) or Selenium tokens in order to earn staking rewards as Selenium tokens. Stakers earn rewards from new Selenium tokens from inflation. LP Tokens can be unstaked at any time. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.selenium.finance/protocol/overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.