JusticeTech System

What Is an Open Port? Imagine your house which has some doors Locked and some Opened An open port means a service is listening for incoming connections. For example: Port 80 If a web server is running, Port 80 is open so browsers can connect. If nothing is using Port 80, it stays closed.

There is thing called an Open Port what does it mean? Let me explain

Can Two Apps Use the Same Port? Usually no because imagine two shops trying to use the exact same shop number in a mall, it would cause confusion. Similarly, if another application is already using a port, a second application usually can't use that same port in the same way at the same time.

At the end i am going to ask 2 basic questions So get ready

This particular table took my time All for the sake of impacting knowledge It's all good Let's go

Common Port Numbers Here are some well-known ports: Port Service What It Does 20 & 21 FTP File transfer 22 SSH Secure remote login 25 SMTP Sending email 53 DNS Converts DN to IP addresses 80 HTTP Normal websites 110 POP3 Receiving email 143 IMAP Email synchronization 443 HTTPS Secure websites 3306 MYSQL Database server 5432 POSTGRESQL Database server 6379 REDIS In-memory data storage

Distracted but i am back... Let's go

I think i cooked with this example 😄😄

Another practical example for those who are still in school Imagine a school that school has one gate, and many students enter through that gate. After entering, they go to: SS1 SS2 SS3 JSS1 JSS2 Now take: The school gate is like the IP address. The classrooms are like ports. The students are like internet data.

Why Are Ports Needed? Without ports, imagine this situation: Someone sends you a whatsApp message, Email, YouTube video, Telegram file etch Your phone receives all the data but it has no idea where to send each one, that would create complete confusion. Ports organize internet traffic.

Anyways let me continue....

Many developers are stuck-out because they never sat down and ask themselves basic questions, listen inspiration alone won't take you far in this space You heard that here first

Or what is the essence of port You see as developers before you engage on any project if you don't ask yourself some little questions you'd likely fail on those projects

The big question here is Why Are Ports Needed?

Hope you are still with me?

Think of ports as different doors. Internet ▼ Phone (One IP Address) Port 80 >> Chrome Port 443 >> YouTube Port 5222 >> WhatsApp Port 443 >> Telegram The operating system checks the port and sends the data to the correct application.

I'm not done yet, stay with me

For instance Zisky is watching "Best python library for WhatsApp bot" on YouTube and Ayo sends zisky a WhatsApp message at thesame time Everything reaches your phone through one internet connection. How does your phone know where each piece of data belongs? The answer is by using port numbers.

Your phone may have these apps open at the same time: WhatsApp Chrome Telegram Spotify YouTube All these apps use the same internet connection, now when information comes from the internet, your phone must know which app should receive this data Ports solve this problem.

How This Relates to Your Phone? Follow me carefully....