<Tr> <Th> Common features </Th> </Tr> <Tr> <Td> <Ul> <Li> Process management </Li> <Li> Interrupts </Li> <Li> Memory management </Li> <Li> File system </Li> <Li> Device drivers </Li> <Li> Networking </Li> <Li> Security </Li> <Li> I / O </Li> </Ul> </Td> </Tr> <Ul> <Li> Process management </Li> <Li> Interrupts </Li> <Li> Memory management </Li> <Li> File system </Li> <Li> Device drivers </Li> <Li> Networking </Li> <Li> Security </Li> <Li> I / O </Li> </Ul> <Li> I / O </Li>

What is computer and its input and output devices