Concurrency is a part of our life: it exists in the real world. When we are discussing concurrency, we are referring to multitasking.
In the real world, many of us perform multitasking frequently. For example, we can write a program while speaking on a mobile phone, we can watch a movie while having dinner, and we can sing while reading notations. There are a lot of examples of how we as humans can multitask. Without going into too much scientific detail, we can look at our brain trying to grasp new things while also commanding the other organs of the body to work, such as the heart or our sense of smell, as a form of multitasking.
The same approach applies to our systems (computers). If we think about today's computers, every computer that is available has a CPU of multiple cores (more than one core). This is to allow multiple instructions...
