Understanding Frontend Backend Database SaaS

01 Front-end (what the user sees)

What is it: the front-end is the interface, the part that the user can see, point and operate.

Where: the interface of the web page, small program, App.

What to use: HTML (structure), CSS (style), JavaScript (interaction).

02 Backend (the part that handles behind the scenes)

What it is: the backend is the brain behind the scenes, responsible for logic and computing.

Where: on the server, invisible to the user.

Role:

Handles login registration

Calculate prices, recommend products

Receive front-end requests, return data

Commonly used programming languages: Java, Python, Go, JavaScript (Node.js)

03 Database (memorized part)

What it is: a database is used to store and manage data.

What is stored: accounts, passwords, orders, inventory...

Common databases:

MySQL, PostgreSQL (relational, like tables)

MongoDB (document-based, like folders)

04 SaaS (Software as a Service)

What is it : SaaS = Software as a Service.

Core features:

Open a webpage/applet/app and it works!

Subscribe on a monthly or yearly basis

Common forms: website, mobile App, applet can be SaaS.

05 Summary

Front-end: the interface that users see and operate

Backend: the logic and computation that runs behind the scenes

Database: where the data is stored and managed

SaaS: software made as a service that users use anytime over the web

Front-end display → back-end processing → database storage → SaaS is the delivery method

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