Inflectional morphology is a branch of linguistics that studies how words change form to express different grammatical features. These changes, known as inflections, can indicate aspects such as tense, mood, number, and case. For example, in English, the verb "walk" can change to "walks" to show third-person singular present tense. Inflectional morphology is essential for understanding how languages convey meaning through word forms. Different languages have unique inflectional systems. For instance, Spanish uses verb conjugations to indicate who is performing the action, while German employs case endings to show the role of nouns in a sentence.