Coffee pads is the collective name for coffee pods that are 62mm in diameter. It is a system that was created by Philips and Douwe Egbert and it is also an open system, which means that anyone can produce pads that fit into these machines.
These are the capsules suitable for Lavazza Point and similar machines. The open standard is called I Espresso System (IES) and it has similar dimensions as the Lavazza Point capsule, which means that both systems capsules are suitable for both types of machines, but there are exceptions.
A system developed by Gaggia in Italy that many coffee roasters offer. The system is semi-open as the roasters may not produce the capsules themself, instead they are all made in Gaggia's own factories.
This is really two systems in onefrom illy. Both capsules are called iperespresso but one has the extension Professional and capsules does not fit in the other systems machines so you have to know which system you have and just buy capsules that fit into that machine.