What causes page faults?

Question

According to Wikipedia:

A page fault is a trap to the software raised by the hardware when a program accesses a page that is mapped in the virtual add

Answer 1

Any time a mmap'd section is read, a page fault is generated, which includes whenever you load a DLL. So, loading a DLL doesn't actually read all of the DLL into memory, it only causes it to be faulted in as the code is executed.