What is the difference between morpheme and grapheme?

A morpheme is the smallest meaningful unit of language that conveys meaning, such as a Word or a part of a Word (like prefixes or suffixes). In contrast, a grapheme is the smallest unit of a writing system, representing a single sound or phoneme, such as letters or characters in an alphabet. Essentially, morphemes are related to meaning in spoken or written language, while graphemes pertain to the visual representation of those sounds in writing.