Load testing is a way to test your website or application that allows you to measure the performance and scalability of your website/application under both normal and anticipated peak load conditions. Load testing can be used to determine how many concurrent users can access your site/application with optimal speed for your end users. It's important to load test your website or application because load testing can help you identify load-related issues that may cause crashes, performance degradation, and system failures. With load testing, you can figure out where load-related problems are happening in your server stack so you can fix them.
Load tests are usually done when you launch your site to the public, if load testing isn't completed before this time, load-related issues may arise after load tests begin. Load tests can be done on both desktop and mobile websites/applications because load testing is about website/application performance and scalability.
Load testing helps you identify load-related issues in your server stack, which can result in crashes, performance degradation, and system failures. By load testing your site/application before launch, load-related problems are much less likely to happen. Load tests are particularly useful if load testing was not completed before launch because load tests help pinpoint load-related issues that load tests would have revealed before the site/application was public. Load testing is also beneficial because load tests help you identify load-related issues in your server stack, which helps make load testing more efficient and less costly.