What is the difference between mov ax, [bx] and mov ax, bx?

Question

assembler

What is the difference between mov ax, [bx] and mov ax, bx?
and actually mov ax, 25 or mov ax, [25]?

Answer 1

mov ax, 25

put the value 25 into register ax

movax, [25]

put the 16-bit value from memory location 25 into register ax