A web browser is a software application that enables a user to access and display web pages or other online content through its graphical user interface.
The browser engine is a core software component of every major web browser, combines structure and style together to draw the web page on your screen, and figure out which bits of it are interactive.
The list below mentions browser engines used by a few common browsers:
WebKit is the web browser engine used by Safari, Mail, App Store, and many other apps on macOS, iOS, and Linux.
Gecko is the name of the layout engine developed by the Mozilla Project, was originally named NGLayout, used in Firefox and SeaMonkey.
Blink is the name of the rendering engine used by Chromium, used in Chrome, Edge, Opera, and other Chromium-based browsers and frameworks.
Servo is a modern, high-performance browser engine designed for both application and embedded use. Sponsored by Mozilla and written in the new systems programming language Rust.