OCR exists and performs well with older hardware.

Collecting your raw data isn’t enough for Microsoft so they might use your PC and power to process your data.

Maybe you're aware and it doesn't fit your need, but in case not: there's a snipping to ocr tool provided with PowerToys. Win+shift+T and select a zone, il ocr it and puts it in your clipboard. Good stuff. There's also NormCap that does the same : https://dynobo.github.io/normcap/

It stands for Neural Processing Unit. It's a processor for running AI. They multiply lots of small numbers really quickly.

It's a big matrix multiplier that is tailored for machine learning model evaluation (not training). Often they are low precision as that's all you need for model evaluation (or "inference").

Think of it as a much less useful GPU because it won't do graphics.