The definition of the second and foeign language

There are many languages in the world.Due to the developing international culture, languages are not only a communication tool but also a culture interchange in many situations.Now, people who can speak second or foreign language have more competitive advantages in their workplace or office.A second language is any language learned after the first language or mother tongue in certain place that the language are spoken by people.For example, when foreigners learn Mandarin as their target language (your learning language) in Taiwan, Mandarin is the second language to the foreigners. On the other hand, a foreign language is any language not spoken by the indigenous people of a certain place.For example, any language beside Mandarin is a foreign language in Taiwan.Such as English, Janapese and Franch.English is the most useful foreign language in Taiwan.