What is synchronous and asynchronous code?

Question

JavaScript

What is synchronous and asynchronous code?
What are the concepts? What is the concept?

Answer 1

great video to help you figure it out

Answer 2

Synchronous hangs the entire process until it is executed, and only then transfers control further, to the lower code.
The asynchronous code pauses and passes control further, but the breakpoint is remembered and control is returned to it in the future under some condition. For example, a timer or an event. Thus, the process does not hang. Moreover, some variables that are needed to execute asynchronous code can be initialized below, but for now this code cannot be executed.

Answer 3

second link on google. leads to a toaster with a similar question and the answer is there