It brings together dictionaries of regional dialects, social and generational slang, and specialist jargon, alongside collections covering Kashubian and selected literary and fictional languages. Visitors can search for words, compare meanings across dictionaries, and browse entries with concise definitions and, where available, usage examples and source information. The collection spans regional varieties such as Silesian, Podhalan, Poznań and Warsaw speech, as well as vocabulary associated with professions, hobbies, subcultures and communities.

The site explains distinctions between dialect, slang and jargon, helping users understand each term in its cultural or professional context. Users can also contribute missing words by submitting a proposed entry, definition and example; submissions are reviewed editorially before publication. eSlowniki.

pl is designed for anyone curious about regional, colloquial or specialist language, offering a searchable reference and a community-supported way to document how vocabulary develops and varies across Poland and beyond. It also provides a catalogue of dictionaries and links to related language-reference services