An online dictionary is a digital resource that provides definitions, pronunciations, and usage examples for words. Unlike traditional printed dictionaries, online dictionaries are easily accessible via the internet, allowing users to search for words quickly. They often include additional features such as synonyms, antonyms, and translations into other languages. Many online dictionaries, like Merriam-Webster and Oxford English Dictionary, offer user-friendly interfaces and mobile applications. These platforms are frequently updated to reflect changes in language and usage, making them valuable tools for students, writers, and anyone looking to enhance their vocabulary.