Grammatical errors are mistakes in the use of language that can affect clarity and understanding. These errors can occur in various forms, such as incorrect verb tenses, subject-verb agreement issues, or improper punctuation. For example, saying "She go to the store" instead of "She goes to the store" is a grammatical error. These mistakes can happen in both spoken and written communication. While some errors may be minor and easily understood, others can lead to confusion. Learning the rules of grammar, such as those found in English or other languages, can help individuals communicate more effectively.