The Natural Language Toolkit (NLTK) is a leading platform for building Python programs to work with human language data. It provides easy-to-use interfaces to over 50 corpora and lexical resources such as WordNet, along with a suite of text processing libraries for classification, tokenization, stemming, tagging, parsing, and semantic reasoning. The NLTK Project is designed to facilitate research and teaching in linguistics, cognitive science, artificial intelligence, and related areas. It is widely used in academia and industry for tasks involving language analysis.