Some people think that correct English grammar matters only to teachers and is of no real importance in daily life. This is certainly not true. Grammar, regardless of the country or the language, is the foundation for communication. When a message is relayed with the correct grammar, it is easier to understand the purpose and meaning of that message. In order to communicate, a learner should know the grammar of the language. It is important to be able to express yourself, but this should be done in a way that people find easy to understand.
Writing that is poorly punctuated and contains grammatical errors is difficult to read and sometimes impossible to understand. If the reader has to go back and re-read a sentence several times because they are not quite sure what it means, it spoils their reading experience and they are quite likely to misunderstand the point or even give up and not read any further.
In linguistics, grammar is the set of structural rules which influences the composition of clauses, phrases, and words in any given language. It is the systematic study and description of a language, and it helps us to understand how words and their component parts combine to form sentences.