Every time you send any cryptocurrency, from your address to another, you incur a Network Transaction fee, also referred to as a Network fee. Making trades on exchanges also require fees for every buy or sell transaction.
The actual fee you pay will vary according to the network you use. For example, a Bitcoin transaction will have a different fee in comparison to transactions placed on the Bitcoin Cash, Ethereum or Litecoin network. There are even tokens that require a secondary or “gas” token to pay the network fees.