However, a time comes when you need to launch the application. It is also where you keep your other files for storage. It is what is commonly called the disk space. Usually, when you download and install a software, it gets placed on your internal Hard Drive. Mac Application Memory is the part of your system that is designed to handle running applications. Solve 'Your System Has Run out of Application Memory' How to Check the Application Memory on Mac What 'Mac Run Out of Application Memory' Means