Computational linguistics

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Computational Linguistics is a field of linguistics that deals with making computers understand human language. Some of the biggest sub-fields of computational linguistics are:

Speech Recognition, which is a computer program that listens to people talk and writes down what they said

Speech Synthesis, which is a computer program that takes writing and reads it out loud

Machine Translation, which is a computer program that turns one language into a different one

Dialog Systems, which is a computer program that talks back-and-forth with a human to help them do something