NLTK is a leading Python platform for processing human language data. It provides an easy-to-use interface to access 50+ corpora and lexical resources, such as WordNet, and offers a suite of text processing libraries for classification, tagging, parsing, and semantic reasoning. It also encapsulates industrial-grade NLP libraries and has an active discussion forum. NLTK is suitable for linguists, engineers, students, educators, researchers, and industry users. NLTK is free to use and an open-source community-driven project.