It allows users to send messages, exchange photos, videos, stickers, audio, and files, react to other users’ messages and interact with bots, and support voice and video calling. Facebook Messenger is an American messaging app and platform developed by Facebook. It allows users to send text messages, and voice messages, make voice calls, and video calls, and share images, documents, user locations, and other media. WhatsApp Messenger or simply WhatsApp is a cross-platform messaging service owned by Facebook, Inc. Network Devices (Hub, Repeater, Bridge, Switch, Router, Gateways and Brouter).Difference between dispatcher and scheduler.Measure the time spent in context switch?.Preemptive and Non-Preemptive Scheduling.Process Table and Process Control Block (PCB).States of a Process in Operating Systems.Privileged and Non-Privileged Instructions in Operating System.Monolithic Kernel and key differences from Microkernel.Kernel I/O Subsystem in Operating System.Difference between Operating System and Kernel.Difference between Application Software and Operating System.Difference between System Software and Application Software.Difference between Hardware and Software.Difference between Bootstrap and WordPress.Difference between Google ads and Facebook ads.Difference between Facebook Messenger and WhatsApp Messenger.ISRO CS Syllabus for Scientist/Engineer Exam.

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