In Zero-Page Addressing, the operand is a memory address rather than a value. Absolute addressing is very similar to Zero-Page Addressing, except that in absolute addressing you must supply the entire 2-byte address, while zero-page addressing only requires the low byte.
This example uses Absolute Addressing to load the accumulator with whatever value is stored in memory address $16A0. Notice that the address is store in little-endian.
0001:AD A0 16 LDA $16A0 ; Load A with whatever value is in memory address $16A0.
Since Absolute addressing is essentially the same as Zero-Page addressing, the use the same opcodes. The following opcodes support absolute addressing: