NLTK (Natural Language Toolkit)

NLTK (Natural Language Toolkit) is an open-source Python platform designed for working with human language data. It offers libraries and interfaces for building programs that process natural language, providing access to over 50 corpora and lexical resources like WordNet. The toolkit includes a suite of text processing libraries for tasks such as classification, tokenization, stemming, tagging, and parsing. It also features a lexicon and rule-based sentiment analysis tool, VADER, which is tuned for social media text and handles nuances in capitalization and punctuation.