Endings in Swedish grammar refer to the various ways that words can be inflected to convey their roles in sentences. Different endings can indicate tense, number, gender, and other grammatical categories. Swedish nouns, for example, have different endings for definite and indefinite forms, and verbs have unique endings to show tense and mood. Learning the common endings in Swedish grammar is essential to mastering the language, as they provide important information about the relationships between words in sentences.