A magnet sticks to a refrigerator because the refrigerator door is made of a ferromagnetic material, such as steel. The magnet and the refrigerator door have opposite magnetic poles, causing them to attract and stick together.

it is a magnet and you just stick it to your fridge

it is a magnet and you just stick it to your fridge

The term "refrigerator magnet" is ambiguous and may refer to any number of types of magnets. However, typically a refrigerator magnet is going to be relatively weak and made of the most inexpensive materials available. Hard refrigerator magnets are likely iron. Flexible refrigerator magnets are made of bonded ferrite powders; barium ferrite is among the most common.

In general classification, a refrigerator magnet is a permanent magnet.

The refrigerator isn't actually a magnet, it it simply made of metal which magnets can then stick to.