Language is seen as a way for humans to communicate using spoken language. Having this ability to communicate using language is considered a typical human characteristic (Pinker 2000). Learning a language, or language acquisition, is something that every child can successfully achieve in a few years. Language acquisition itself is the development of human ability to generate and use words to acquire, understand and communicate perception.
Researchers scored language learning in two categories, first language acquisition and second language acquisition. Learning the first language is a universal process regardless of your mother tongue. The baby listens to the sounds around them, begins to mimic them, and eventually starts to produce words. Second language learns the knowledge of the first language hypothesis and includes processes that individuals experience when learning new language elements such as vocabulary, speech components, grammatical structure, writing system.
Second language acquisition (SLA), second language learning, or L2 (language 2) acquisition is the process by which people learn a second language. Second language acquisition is also a science field devoted to studying this process. The second language acquisition field is a sub-field of applied linguistics, but it is also subject to research in various other fields such as psychology and education. The central theme of SLA research is interlanguage and the language used by learners is not only the result of the difference between the languages they already know and the languages they are learning but also the complete language system. It has its own authority and has its own system rule. When a learner touches a target language, this inter-language language develops gradually.
Learning and learning of the second language is defined as acquisition and acquisition of the second language once mastering of the mother tongue or first language is established. Second language acquisition (SLA) is a process of learning other languages in addition to their mother tongue. For example, children speaking their mother tongues begin learning English at the beginning of school. I will learn English through the learning process of the second language. In fact, young children can learn second language earlier than adults learn the same language.
The important difference between first language acquisition and second language acquisition is that the process of second language acquisition is influenced by the language already learned by the learner. This effect is called language transfer. Language transition is a complex phenomenon due to the previous linguistic knowledge of the learner, the interaction between the target language input they encounter and their cognitive process. Language transfer can occur not only from the learner's mother tongue but also from the second language or the third language. Also, language transfers may occur in grammar, pronunciation, vocabulary, discourse, and reading, not limited to a specific language domain.