What is front end and back end ?

Answer 1

https://www.sololearn.com/Discuss/2476303/?ref=app
https://www.sololearn.com/Discuss/2420711/?ref=app

Answer 2

Backend — anything that runs on a server, i.e. "not in a browser" or "on a computer connected to a network (usually the Internet) that responds to messages from other computers".
For the backend, you can use any tools available on your server (which is essentially just a computer configured to respond to messages). This means that you can use any universal programming language: Ruby, PHP, Python, Java, JavaScript / Node, bash. This also means that you can use database management systems such as MySQL, PostgreSQL, MongoDB, Cassandra, Redis, Memcached.

Answer 3

Frontend — anything that the browser can read, display, and / or run. That is, it is HTML, CSS, and JavaScript.
HTML (Hypertext Markup Language) tells the browser what the content of the page is, for example, "title", "paragraph", "list", "list item".
CSS (Cascading Style Sheets) tells the browser how to display elements, for example, "after the first paragraph, an indent of 20 pixels" or "all text in the body element should be dark gray and written in the font Verdana".
JavaScript tells the browser how to respond to certain interactions using a lightweight programming language. Most sites don't actually use a lot of JavaScript code, but if you click on something and the page content changes without the screen flashing white, it means that JavaScript was used somewhere.