Devanagari is a syllabic script used to write Sanskrit, Hindi, Marathi, and Nepali languages, developed from the North Indian monumental script known as Gupta and ultimately from the Brahms alphabet, from which all modern Indian writing systems are derived. In use from the 7th century CE and occurring in its mature form from the 11th century onward, Devanagari is characterized by long, horizontal strokes at the tops of the letters, usually joined in modern usage to form a continuous horizontal line through the script when written.

in simpe words, 'devanagari' is the 'name' of script in which sanskrit, hindi, marathi, nepali is written देवनागरी