What is Natural Language Processing (NLP) and what are its main applications?

Natural Language Processing (NLP) is a field of artificial intelligence that focuses on the interaction between computers and human language. It involves the ability of a machine to read, understand, interpret, and generate human language in a meaningful way. Main applications of NLP include machine translation (e.g., Google Translate), sentiment analysis (determining the sentiment behind texts), chatbots and virtual assistants (like Alexa and Siri), text summarization, and information extraction. NLP leverages techniques from linguistics and machine learning to process and analyze large amounts of natural language data.