Cat food is a food made specifically for consumption by cats.
Cat food normally consists of meat which is manufactured to their dietary and nutritional requirements and dry cat food that is then packaged appropriately for them.
It is sold in many different supermarkets and grocery stores around the world.
Cat food has become a huge market for may manufacturers due to the popularity of cats as pets. (source)
So can hamsters eat cat food?
Unfortunately they cant eat cat food at all.
Cat food is specifically designed and made for the diet of cats and is not suitable for hamsters.