Very confused, in some websites, they have this line:

iPhone 5s

CPU: Apple A7

other websites saying that:

iPhone 5s
System-on-chip: Apple 7
CPU: 1.3 GHz 64bit dual core

other sources saying that

iPhone 5s
System-on-chip: Apple 7
CPU: 1.3 GHz 64bit dual core Apple 7

In Wikipedia, it said:

The Apple A7 is a 64-bit system on a chip (SoC) designed by Apple Inc. It first appeared in the iPhone 5S, which was introduced on September 10, 2013. Apple states that it is up to twice as fast and has up to twice the graphics power compared to its predecessor, the Apple A6. While not the first 64-bit ARM CPU, it is the first to ship in a consumer smartphone or tablet computer.

There are 2 sentences:

The Apple A7 is a 64-bit system on a chip (SoC)

and

While not the first 64-bit ARM CPU

Wikipedia also said “The A7 features an Apple-designed 64-bit 1.3–1.4 GHz ARMv8-A dual-core CPU, called Cyclone”. So System on chip is also CPU? very confused