Grammar refers to the set of rules used to build sentences and define the relationships between words to allow for more effective communication. While children acquire language naturally without being explicitly taught grammar, practicing complex grammar structures can help them learn faster and improve through comparison. However, learning a language solely through dictionaries and grammar rules is the wrong approach and will not result in strong speaking skills. It is important to use the language for communicative purposes and take into account all language skills. Common grammar exercises include error correction, sentence transformation, and gap-filling activities.