1.

One of the functions of the kernel is to serve as a link between a computer's hardware and software. Memory, CPU, input-output devices, and other crucial resources are all under its management. Device drivers, memory management, access to file systems, process and process management, and security mechanisms are only a few of the services offered by the kernel.

2.

Linux is a kernel, not an actual operating system. A computer operating system is made up of a number of parts, such as the kernel, system utilities, libraries, graphical user interfaces, and application software. When people refer to Linux, they frequently mean a complete operating system distribution that combines the Linux kernel with a number of different software programs to produce a workable and useful system.

3.

Although Linux has certain security advantages over other operating systems, it is not impervious to malware. Given that hackers are continually identifying new vulnerabilities and creating fresh techniques to corrupt computers, no operating system is totally immune to malware. Linux is typically more secure than some other operating systems, such as Windows, thanks to its design, open-source nature, and robust permission scheme. But the security of the system depends on more than just the kernel; it also depends on user behavior, system administrators, and the general security of the programs and services that use the system.