You might want to send any DOT you own to your Metamask wallet. DOT does, however, have its own native blockchain called Polkadot, which cannot be added to your Metamask wallet.
Polkadot is one of the most promising crypto projects at the moment. Since it is a new blockchain technology compared to bitcoins, lightcoins, etc., it is not available on various crypto-exchanges and platforms.
Polkadot (DOT) is a cryptocurrency that enables cross-chain transfers of any type of data or asset. Its network is composed of parachains, which are blockchain networks that can communicate with each other through the relay chain. DOT holders can staking their tokens to validate transactions and earn rewards.
Polkadot cryptocurrency is part of a unique blockchain ecosystem that takes the capabilities of decentralized technologies and cryptocurrencies to a fundamentally new level. The properties of the project allowed it to gain notable popularity in a short period of time and firmly establish itself in the top 10 of the world's top coins by capitalization.
Polkadot is a technology designed to increase the interoperability of different blockchains, such as Bitcoin and Ethereum, and combine them into a single multiblockchain.