A semantic field is a group of words that are related in meaning and share a common theme. For example, words like dog, cat, hamster, and rabbit all belong to the semantic field of pets. This concept helps in understanding how language organizes ideas and concepts, making it easier to communicate specific topics. Semantic fields can also reveal relationships between words and their meanings. For instance, the semantic field of emotions includes words like happiness, sadness, anger, and fear. By studying these fields, linguists can analyze how language reflects human experiences and social interactions.