MIPS (Microprocessor without Interlocked Pipeline Stages) is a language like x86.
It uses the RISC architecture (Reduced instruction set of computing).
It is primarily used on Apple devices.

It is sortof a simplified version of x86, but with slightly different syntax and names.

Registers

Unlike x86 where every register has its own name, MIPS just adds a number to the end.
Additionally, each register can hold any size in it.

Saved:
$s0 - $s7

Temp:
$t0 - $t9

Argument:
$a0 - $a3

Return:
$v0 for lower 32 bits
$v1 for upper 32 bits
but still only one register

Floating point:
$f0 - $f31

Stack
$sp

Frame
$fp

Return address
$ra

Contains the value 0:
$zero

Terminology Change

x86MIPS
bytebyte
wordhalf-world
dwordword