What is a wallet
Private keys and addresses need an object to be kept in a unified manner. This management tool is called a wallet.
The Bitcoin wallet is equivalent to your physical wallet address, which is equivalent to a bank card in your wallet, and the private key is the password of your bank card.
Online and offline wallets
An online wallet is a private key generated by the Internet or a wallet that is connected to the Internet. Also called a hot wallet.
Offline wallets are wallets that are not connected to the Internet, also known as cold wallets. Because the cold wallet is not connected to the Internet, it greatly reduces the probability of theft by hackers. It is relatively safe, but it is more complicated to operate and is suitable for people with technical backgrounds.
Three wallets that are more suitable for the masses:
The first category is full node wallets. The full node wallet is also an early wallet form, and it includes all the data of the Bitcoin network so far.
The second category is the light wallet. This kind of wallet only maintains data related to your own transactions and does not synchronize other data. It is also a centralized wallet.
The third category is the centralized wallet. It relies entirely on the servers of the company running this wallet not syncing Bitcoin network data.