according to~
States the source of information or basis for a statement, equivalent to 'according to'.
This pattern marks the source of information, such as a person, news report, book, or survey. It is often used when reporting something you have heard or read, not something you know from direct experience. The main clause can be a statement, opinion, or prediction, but it cannot be a command, request, or invitation.
The two forms, によると and によれば, are essentially interchangeable. によれば may sound slightly more formal or literary. In everyday speech, によると is more common.