You can know many ways to talk. 
You can use many ways to talk. 

Multilingualism is using more than one language. 
Some children learn two languages at the same time. We call these children simultaneous bilinguals. They often find it easy to learn more languages later. 
Sometimes, people can understand a language but cannot speak it. This is called receptive bilingualism. You might see this in families where parents and children speak different languages. 
Multilingualism is when a person or a group uses more than one language. 

Learning a language can happen in different ways. Some children are simultaneous bilinguals. This means they learn two languages at the same time from a very young age. Scholars like Noam Chomsky suggest humans have a special way to learn language rules. 
History shows that people have used many languages for a long time.
Different countries have different rules for learning languages. 

Language is also a big part of how we use computers. Most software is made using English first. Other versions might be made later for different languages. This is part of a process called localization. 

Multilingualism is the use of more than one language by an individual or a group. 
Language acquisition occurs through different processes. Many people acquire their first language, or L1, during childhood without formal education. Children who learn two languages natively from these early years are called simultaneous bilinguals. These children are often more proficient in one language than the other. Some scholars, like Noam Chomsky, suggest humans possess a language acquisition device. This internal mechanism helps learners recreate the rules of a language. Chomsky argued this device may wear out by puberty. This could explain why adults sometimes struggle more with second language (L2) learning.
There is a wide spectrum of what it means to be multilingual. At one end, some define it as total mastery of multiple languages. Such speakers have control equivalent to a native speaker. At the other end, some people only know enough phrases to navigate as tourists. Since 1992, the scholar Vivian Cook has proposed a middle ground. He uses the term "multi-competent" for those falling between these two extremes. This definition accounts for the varying levels of fluency people actually possess.
Defining what constitutes a distinct language is also complex. Scholars often disagree on whether certain speech varieties are languages or dialects. For example, there is debate over whether Scots is a language or an English dialect. Language definitions can also change for political reasons. The creation of Serbo-Croatian once served as an umbrella for several South Slavic dialects. After Yugoslavia broke up, it split into Serbian, Croatian, Bosnian, and Montenegrin. Similarly, Russian tsars once dismissed Ukrainian as a Russian dialect to discourage national feelings.
Multilingualism has deep historical roots.
Education systems around the world reflect these linguistic realities. In Finland, all schoolchildren must learn at least three languages. They study the two national languages, Finnish and Swedish, plus a foreign language like English. 
Some people experience receptive bilingualism. These individuals can understand a second language but cannot speak it. 

Multilingualism also extends into the world of computing. Software development almost always uses English due to its global status. 
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