Polkadot token, DOT, is primarily used for maintaining and operating the Polkadot network. It serves as a governance token, allowing holders to participate in decision-making for the network. Additionally, DOT is used for staking, where token holders can lock their tokens to secure the network and earn rewards. Polkadot's architecture enables cross-chain interoperability, scalability, and shared security, making DOT a crucial component of its ecosystem.