Have you ever made your laptop cry? (it's a serious question trust me 😂), you know that moment when your laptop's fan starts blowing a lot harder than it usually does, thus causing your laptop to make whiny sounds? I term it as making your laptop cry. It usually happens when your laptop processor(s) is/are put under undue pressure. Depending on how you use your laptop, the amount of RAM on your laptop, and the type of processor on your laptop, your laptop is likely to get stressed if you open graphically intensive applications (or if you open like 30 tabs on your Google Chrome browser 😉) and want to keep using them actively.
A RELATABLE EXPLANATION
Software developers typically stress their laptops, the applications we run are usually powerful, while code editors are lighter development environments and stress the processor of a software engineer less frequently, we also have more powerful tools like IDEs (Integrated Development Environments) where very powerful applications are built; from desktop applications to mobile applications, as well as other enterprise-level software solutions. What typically happens when these solutions are coded is that after writing a bit of the code, you run the application to test if what you've written is giving you the desired result, this fires up your processor, putting additional strain on the laptop. Averagely, developers do this at least 20 times a day (when coding), by now you're starting to get that this can be quite a chore.
HOT RELOAD EXPLAINED
The process of running the software solution in order to debug it isn't instantaneous, the software has to compile the solution, and create a development environment for the code to display, depending on the size of the project, it can take anywhere from a minute to almost an hour (for a couple of large projects), so we sit, waiting for the environment to come up while hearing our laptops wail 😥. To solve this problem, a lot of code editors have what we call "Hot Reload", which typically lets you run the application, check for issues and continue writing code that automatically syncs into that environment. Prior to this, you have to shut down the development environment/server in order to write more code, save the changes and run the development environment against 😓.
FINALLY...
Since Hot Reload became a thing, a lot of code editors have caught up with it, it works great for frontend development. However, a lot of backend and full-stack (a combination of frontend and backend) development applications (IDEs) haven't been able to implement this feature and it has caused developers a lot of pain. Recently, Microsoft announced that the latest release of their IDE (Visual Studio 2022) will have Hot Reload, it was a huge announcement that rocked the world of software development as 76% of developers use IDEs, with Visual Studio being one of the favourites. This puts more pressure on other IDEs like Android Studio (which Google and JetBrains are responsible for) to implement Hot Reload in their application 😂.