While Selenium testing, you may have come across a requirement where you need to either download or upload a file in Selenium. Almost every web application over the internet may have a feature for allowing users to either download or upload a file. Be it a rich-media platform such as YouTube which lets you upload video files, an online photo collage maker, or an e-commerce web application which allows you to upload images. Even writing assistants like Grammarly and Plagiarism checker like Quetext offer an uploading file functionality.
Similarly, these websites offer downloading functionality, too. YouTube allows offline downloading, and e-commerce platforms such as Amazon will let you download the invoices of your orders. My point is that if you are an automation tester who has a routine set around Selenium testing, there is a good chance for you to run into a requirement where you may have to test a feature around downloading or uploading files in Selenium WebDriver.