A lexicon is a collection of words and their meanings, often specific to a particular language, field, or subject. It serves as a reference tool, helping individuals understand vocabulary and usage. Lexicons can be found in dictionaries, specialized glossaries, or even in digital formats, providing definitions, synonyms, and examples of how words are used in context. In linguistics, a lexicon encompasses not just words but also phrases and expressions that convey meaning. Each language has its own unique lexicon, shaped by culture, history, and social interactions. For instance, the lexicon of computer science includes terms like "algorithm" and "software," which may not be familiar to those outside the field.