Absolute addressing in the 6502 microprocessor is a way to address the 6502's memory addresses. Unlike zero page addressing, absolute addressing requires the full two bytes of a memory address be included. This way, all of the memory locations of the 6502 can be accessed.
The above example loads the contents of memory address $0244 to the accumulator.
If you are working with the zero page, you should use zero page addressing instead.