A burn-in oven is a big, hot, box-shaped oven that is used to test and prepare electronic components before they are put into products like cell phones or computers.
Imagine you just made some cookies, but before you eat them, you want to make sure they are good enough so you put them in the oven for a little longer. That's kind of like what a burn-in oven does, but instead of cookies, it tests electronic parts like computer chips.
Inside the burn-in oven, there are shelves where electronic components are placed. The oven is then heated up to a very high temperature, sometimes as hot as 250 degrees Celsius!
This heats up the electronic components and helps to identify any problems before they are used in a product. Just like how you might test a toy before you play with it to make sure it's safe, this is testing electronic components to make sure they will work properly and won't break easily.
The electronic components might stay in the burn-in oven for several hours, even up to a few days, until they are determined to be ready for use.
So, a burn-in oven is basically a big, hot oven that helps make sure electronic components are safe and work properly before they are put into our phones, computers, and other devices.