Pump.fun is a decentralized token issuance platform deployed on the Solana (SOL) chain, allowing users to create and trade MEME-based micro-tokens (Mini-Token), forming a 'social + speculative' token trading market. Often, these tokens perform more aggressively than mainstream coins in the late stages of a bull market. It's advisable to set stop-loss levels at 0.0025 when entering, as these tokens carry significant risks. They are suitable for small investors looking to take a chance.