Second Language is

Correct option is C

A second language is any language other than the learner's native language or mother tongue. It is the language that a person learns after their first language. Second languages can be learned at any age, but it is generally easier to learn a second language when one is younger. Second languages are important for a number of reasons. They can help people to communicate with people from other cultures, to access new information and opportunities, and to develop their cognitive skills.

Second languages can be learned in a variety of ways, including through formal education, immersion programs, and self-study. There is no one best way to learn a second language, and the best method will vary depending on the individual learner's needs and preferences. Learning a second language can be challenging, but it is also a rewarding experience. It can open up new worlds of opportunity and help people to connect with people from all over the world.

In linguistics, a second language (L2) is typically the language that a person learns after acquiring their first language (L1), which is usually the mother tongue.

It is learned formally (in school) or informally (through exposure in society).

It can sometimes be used more often than the native language, depending on the environment.

Information Booster:
First Language (L1): The language a person acquires first, usually in early childhood.

Second Language (L2): Learned after the first language; can be official in a country (e.g., English in India).

Foreign Language: Learned for specific purposes but not widely used in the learner’s immediate community.

Additional Knowledge:
"The Language Second In Importance In Terms Of The Use Of Languages By A Learner" – This is more of a functional definition, not the standard linguistic one. Importance and frequency of use may vary and don’t necessarily define “second language.”

"The Language Used By A Second-Generation Learner" – This is misleading. A second-generation learner might learn their heritage language as a second language, but this is a different context.

"The Language Which Is The Learner's Native Language But Not The Mother Tongue" – This is contradictory because native language and mother tongue are often the same in linguistics.