1.Between the hardware and software of a computer, the kernel serves as a link. 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.Not an operating system in and of itself, Linux is a kernel. 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.Linux is not immune to malware, but it does have several security advantages over other operating systems. Because hackers are always discovering new vulnerabilities and creating fresh ways to corrupt systems, no operating system is totally immune to malware. Because of its open-source status, robust permission scheme, and safe design, Linux is generally more secure than rival operating systems like Windows. However, the security of the system is not completely reliant on the kernel; it also depends on user behavior, system administrators, and the general security of the applications and services that are operating on the system.