To refer to memory.
addresses
Variables (or constants) that contain addresses.
In programming languages, variables are used to store data values, while pointers are variables that store memory addresses of other variables. Variables directly hold data, while pointers hold the location of where data is stored in memory.
POINTERS ARE USED TO STORE ADDRESS
They aren't. Java uses the (safer) idea of references instead of pointers.
no , laser pointers emit a lower wavelength of radiation
A short pointer typically refers to a pointer that occupies fewer bytes (usually 2 bytes), while a long pointer is a pointer that occupies more bytes (usually 4 or 8 bytes) to represent memory addresses in computer programming languages. Short pointers are more limited in the range of memory addresses they can access compared to long pointers.
Because the laser pointers are much easier to use than the ball pointers. The ball pointers are often difficult to move around while the laser pointers can move in any direction without "getting stuck"
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summary addresses
To read and write to I/O
For V4 addresses they are separated by a period (.). For V6 addresses they are separated by a colon (:)