What is the difference between a flip phone and clamshell phone?

Clamshell or flip phones were popular in the early 2000s. When clamshell phones are closed they take up a very minimal amount of space. Clamshell phones do not have a QWERTY keyboard, have a very small screen and are easily broken. Slider phones are a versatile phone. On the outside of the phone there is a touchscreen. There is a bottom compartment to the phone that will reveal a QWERTY keyboard.