Quote from: o_e_l_e_o on June 10, 2020, 11:53:14 AM

Quote from: Charles-Tim on June 10, 2020, 11:31:47 AM

Also, if I have an open source wallet like bitcoin core and eletrum, are they example of bitcoin client?

Bitcoin Core is a bitcoin client. Electrum is not - it is just a wallet.

i don't think there is a strict definition for the term "client". the client is usually referred to software that is capable of some pretty basic functionality including private/public key and address generation, transaction signing and connecting to bitcoin network (in one way or another).
with that definition a client can include full nodes, pruned nodes, SPV nodes and mobile wallets. the only thing that may not fall in a "client" category is web wallets and custodial wallets.

for more info an a list: https://en.bitcoin.it/wiki/Clients