It is a virtual currency and intangible (currency). It has a changing value as if it were shares. They are stored in a "Wallet", from which you can send or receive.
Bitcoin transactions are made directly, without the need for intermediaries. No need for banks or financial institutions. The Bitcoin is not backed by any government or depends on confidence in any central issuer.
BTC = 1
Dbtc = 0.1
CBTC = 0.01
MBTC = 0.001
μBTC = 0.000001
Satoshi = 0.00000001 The smallest unit