Synchronous Vs Asynchronous

Synchronous:

Blocking, single-threaded
only one operation can progress at a time
code is executed sequentially from top to bottom, blocking on long running tasks such as network req. and disk I/O.
result wait and execute sequentially.
Highly readable code
easy to implement logic
cost effective, convenient
strictly technology based, demandes high speed internet, internet connection, local time barriers, requires careful planning.
eg: php, java, python

Asynchronous

Normal js which has some ajax calls which dynamically load data from server without affecting the current flow of execution.
no wait for result and execute sequentially.
using asynchronous js (such as callbacks, promises and async/wait), you can perform long network req. without blocking the main thread.
fast execution
eg: reactive programming
hard to implement logic
eg: javascript, typescript
no result wait so hard to handle result
asynchronous result handle (use callback, promise, observable)
async/await treat js async function as a sync function.

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