Some types of clasps are more secure than others and some are more difficult to open and close without help from another person.
Spring Ring ClaspsA spring ring clasp opens when you push backwards on a little lever that slides along a circular ring. Once the clasp is open open you simply insert the chain or loop that's attached to the piece you're connecting into the open circle, then release the lever to return it to the closed position. There's a tiny spring inside the clasp that puts pressure on the mechanism to keep the spring ring shut until you decide to open it again.
Spring ring clasps are commonly used to secure necklaces, bracelets and anklets, but some people have a difficult time operating very tiny spring ring clasps by themselves. Clasps that attach to a good sized loop that you can handle easily--or to a rigid piece--are easier to handle.