What is the difference between synchronous and asynchronous programming (in node.js)

Question

I\'ve been reading nodebeginner And I came across the following two pieces of code.

The first one:

    var result = database.query(\"SELECT * FROM hu         


        

Answer 1

The function makes the second one asynchronous.

The first one forces the program to wait for each line to finish it's run before the next one can continue. The second one allows each line to run together (and independently) at once.

Languages and frameworks (js, node.js) that allow asynchronous or concurrency is great for things that require real time transmission (eg. chat, stock applications).