In practice and theory, it is not possible to send bitcoins from one address to another without processing fee. When the network traffic is low, the transaction fee is low.
Why is that? Because Bitcoin is a working proof that is required by a node that tries to guess the input of a hash function first to become a Bloop creator.
To estimate the input of a pair of SHA-256, you get the right block, the right amount of zero before the new block's clutter. It gets a lot of trial and error, but when discovered, it's easy and fast. all other nodes to verify.
The goal of making all the nodes to make troublesome confusion is to encourage them to be honest and to create only mine blocks with the right actions. Producing a wrong block will lead to a loss of mining awards and not working for nothing.
It is always a cost to have a transaction that you send to the network block according to the design, and there is no way to avoid paying the transaction fee because if you set the price to zero, the miner will not accept it.
