Communication access real-time translation (CART) is like having a person who can quickly and easily translate what people are saying into written words on a screen.
For example, imagine you are watching a talk show on TV and the host is speaking really fast. You might not be able to understand everything they’re saying, or you might miss important parts of the conversation. But if there was a CART provider there, they could type out everything the host is saying on a screen in real-time (meaning at the same time as they're speaking).
This can be really helpful for people who are deaf or have hearing loss, because it allows them to "read" what people are saying, even if they can't hear it. It's also helpful for people who have trouble understanding accents or who speak a different language, because they can read the translation in their own language.
CART providers are specially trained to use computer programs to quickly and accurately transcribe (or write out) what people are saying. They may work in person or remotely, using special software and equipment to make sure that the words are transcribed accurately and quickly.
In short, CART is like having a super-fast and accurate translator typing out everything people are saying, so that everyone can understand what's going on.