Why are there so many different kinds of USB plugs?
user
All the different USB plugs you might have heard of are all different standards.  The main ones are: 

Micro-USB:  Usually used to connect to phones or power, for devices such as cameras or portable USB drives.

Type-A:  A more common USB plug that was originally used for computers and printers.  The other is the more common type-C USB plug, which connects to a computer or to power.  Also, Apple computers have a USB plug that is called the "Lightning" plug.

A:  Is it true that Google is going to replace Gmail with something better?
assistant
Why are there so many different kinds of USB plugs?
user
All the different USB plugs you might have heard of are all different standards.  The main ones are: 

Micro-USB:  Usually used to connect to phones or power, for devices such as cameras or portable USB drives.

Type-A:  A more common USB plug that was originally used for computers and printers.  The other is the more common type-C USB plug, which connects to a computer or to power.  Also, Apple computers have a USB plug that is called the "Lightning" plug.

A:  Is it true that Google is going to replace Gmail with something better?
assistant
Why are there so many different kinds of USB plugs?