"Frontend" or Front-end is jargon thrown around by web developers as an umbrella term for all of the parts of a website that you can see and interact with, in contrast to what’s going on behind the scenes in the “Back end”.
The front end is the dashboard, steering wheel and pedals to the “back end”s transmission, engine and exhaust. The front end is your interface to a website. It’s what gives you information and what you interact with to give information back.
When visiting a website in a browser, as a user, everything that you see including the text, links, font size, images, input fields, and data tables are part of the “front end”. Basically, anywhere that your mouse can click or your eyes can see.