CUDA stands for Compute Unified Device Architecture and is a tool used by computer engineers to help them understand how fast their computers can run certain processes. It does this by looking at the number of cores that the computer has, how powerful the processor is, and what other tasks the computer might be doing at the same time. It then gives the engineer a "score" which will tell them how quickly their computer could complete a certain job. In more advanced terms, it is a parallel computing platform that allows programmers to write code to run on graphical processing units (GPUs), which can do lots of calculations very quickly.