Why Do People Want to Learn a Second Language?

Have you ever thought about why people really want to learn another language? well I've always thought about this and I've realised that we have several reasons, one of this may be related to politics, this has to do with what language is the most important one in the world. It has to do with the necessity of speaking the language that the entire world is speaking in order to be able to comunicate with other people, beacuse of business for example.
another reason I have thought about is the motivation that some people have to know something about a different culture, because they may have friends, or family.

During my research I've found three concepts given by Gardner ( 1985) that explain very clearly the reasons that people may have in order to learn a second language:

"Integrative orientation": which reflects a positive disposition toward the L2 group and the desire to interact with and even become similar to valued members of that comunity.

"Instrumental orientation" where language learning is primarily associated with the potential gains of L2 proficiency, such as getting a better job or a higher salary

"The integrative motive" which is a complex construct made up of three main components
a) integrativeness---> subsuming integrative orientation, interest in foreign languages , and attitudes toward the L2 comunity.
b) attittudes toward the learning situation---> comprising attitudes toward the teacher and the course.
c) motivation---> made of motivational intensity, desire and attitudes towards learning the language.

another reason could be the expectancy of success, this has to do with learner's confidence this means their potential to carry out the tasks they are given.

Another important point is learners' initial beliefs about L2 for example beliefs like the amount of time it will take them to learn a second language. If they think it will take them too long it could affect motivation because obviously they would feel disapointed.