Within the context of web development, front-end developers generally tend to work on the user-facing portions of a website or app. They generally spend their time working with client-side technologies that make up a website, such as HTML, JavaScript, and CSS.
Back-end developers tend to work with the server-side technologies that power the site’s functionality.
The two roles are closely related in that they must generally work together to create a fully functioning website. The split itself comes from how the web is architected at a fundamental level, where the client-side is generally referred to as the browser, and the server-side is the technology stack that receives requests and generates responses.
Related Careers

Psychologist
A psychologist is someone who studies mental processes and human behaviour by observing, interpreting, and recording how people relate to one another and the environment.
Social Worker
There are two main types of social workers: direct-service social workers, who help people solve and cope with problems in their everyday lives, and clinical social workers, who diagnose and treat mental, behavioural, and emotional issues.