OPERATING SYSTEM NOTES is a free Android application developed by Tech Zone Apps that offers a comprehensive guide to operating systems. The app is designed to teach users about the concept of operating systems in detail and in an easy-to-understand way.

The app covers all the important aspects of operating systems, starting from the introduction to evolution, types, process and multi-threading, process scheduling, CPU scheduling, threads, process synchronization, synchronization problem, deadlock, memory management, virtual memory, and file system.

The user interface is simple and easy to navigate, making it easy for users to access the information they need. The app contains 14 chapters, each covering a different aspect of operating systems. Overall, OPERATING SYSTEM NOTES is a great app for anyone looking to learn about operating systems.