The document discusses the different addressing modes of the 8085 microprocessor. There are 5 addressing modes: 1) Direct addressing mode specifies the operand address in the instruction itself. 2) Register addressing mode uses a register as the operand. 3) Register indirect addressing mode specifies the operand address using a register pair. 4) Immediate addressing mode encodes the operand within the instruction. 5) Implicit addressing mode does not require operands as the source and destination are fixed. These addressing modes define how operands are specified in instructions for the 8085 microprocessor.