Definition & Meaning of "null-subject language"

What is a "null-subject language"?

A null-subject language is a type of language where it is grammatically acceptable to omit the subject in a sentence when the subject can be understood from the verb or context. In these languages, the verb often contains enough information, such as tense, person, and number, to indicate the subject without needing to explicitly mention it. For example, in Spanish, Italian, and Persian, a sentence like "I am going" can simply be "Am going," since the verb form already makes it clear who the subject is. This feature allows for more concise sentences and relies on context and verb forms to convey the subject.