The relationship of the second language to the first language

Language, which is the most important communication tool, is an important issue that makes us different from other languages. People from childhood acquire one language and can later learn more than one language. However, people's second language acquisition will be different from their first language. There are a few differences between the first and second language. 

The first language is a person's native language, while the second language is the language learned to communicate with someone else's mother tongue. 

The first language is a mandatory language we learn from birth, but a second language is an option. 

The first language acquisition is fast, but the second language acquisition varies according to the person or language, it is not learned as quickly as the first language. 

The first language is "learned" and the second language is "learned". 

The first language does not require effort, it takes effort for a second language learner to learn the structures of the language.