bitcoin Atom is a fork of the bitcoin blockchain with major protocol upgrades that will occur in January (block number TBA). At the predetermined block number the original BTC blockchain will be forked into BCA, and any transactions made since then will be completely separate on bitcoin and bitcoin Atom networks. At that moment, bitcoin Atom will go live on mainnet and become a fully functional cryptocurrency.
All bitcoin holders who possess their private keys at the moment of the fork (block number TBA) will receive bitcoin Atom at the rate of 1 BTC = 1 BCA. You need to control your bitcoin private keys in order to claim and transact bitcoin Atom.
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Sources:
coinmarketcap.com
bitcoinatom.io
bitcointalk.org