NLTK (Natural Language Toolkit) is a powerful library in Python that provides easy-to-use interfaces to over 50 corpora and lexical resources, including WordNet.
BeautifulSoup is a Python library designed to parse HTML and XML documents. It simplifies tasks like iterating and searching HTML elements by attributes.
Subsequences derived from strings by deleting some or no characters without changing order, are crucial in fields like bioinformatics, data mining, and cryptography.
Visualizing a binary tree can help in understanding its structure and the relationships between its nodes. It is particularly useful for debugging problems with complex Binary Trees.