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when I am using ‘localhost’ as the host for MySQL database, sequel pro alert me that I will be using socket. On the other hand, if I use ‘127.0.0.1’, i would be using the ip address and port 3306 to reach the server.
What is the difference?
A Unix socket is a data communications endpoint that is similar to an network socket, but does not use a network protocol for communication. These are used in POSIX operating systems for inter-process communication. (Source)
The “localhost -> socket” rule appears to be hardcoded in the MySQL client library, according to a forum post by a MySQL developer. (Source)