A pistol safe is just like a handgun safe just big enough to store small
guns. They are usually either equipped with a combination lock or a key lock. If
you are only intending to protect your hand gun from children or thieves this is
a good option. Pistol safes are small and quite cheap. Normally they look
similar to cash boxes.
However this is not the way to go if you are looking for a safe where you can
also store bigger things. If this is the case you should consider buying a
regular safe such as a wall safe, floor safe or depository safe.
Bigger weapons like rifles cannot be stored in pistol safes. There are safes
especially made for this purpose, gun safes. They are usually quite tall so all
kinds of guns can fit in. They also can be used to store other stuff besides
weapons, e.g. jewelry, important documents.