RTOS - Real Time Operating System is a software component mainly used in embedded systems as software to manage the various tasks and most importantly meet the deadlines.

@startuml Bob -> Alice : hello @enduml

Types

Generally, RTOS is divided into two types, based on the need to meet the task deadlines.

1. Hard RTOS
2. Soft RTOS

Bob -> Alice : hello world

Hard RTOS which may result in catastrophic event if deadline of the task is missed, while Soft RTOS may only slow the system in case the task deadline is missed.

@startuml
[Real Time Operating System] ..>[Hard RTOS]
[Real Time Operating System] ..>[Soft RTOS]
@enduml