Interpreting,this unknown

What does “interpreting” mean? Why is an “interpreter” needed? Interpreting is “Acting as interpreter, ambassador of others’ ideas or feelings, so the interpreter is the ‘professional charged with making possible, by means of timely oral translation, the conversation or correspondence among people speaking different languages’.

The interpreter is the essential figure to make agreements and exchanges possible between companies from different countries, increasing work in a professional manner and ensuring correct understanding.