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It's the same as a fuse box. Sort of. The electric service panel used to be called the fuse box, fuse panel,  circuit breaker panel, or any number of other terms. Today, most homes have what we call the electrical service panel, or simply, the service panel. It's not literally the same thing, but it does provide the same function.
The simplest and most common type of DI Box is the passive DI. This is generally used to match line level or instrument level sources such like guitars and keyboards, and matches them to the mic inputs. Often, these also have a ground lift switch (this can sometimes reduce unwanted hums and noise).