What is demand pagging?

Demand paging is a memory management technique in which pages of a program are loaded into RAM only when they are needed, rather than loading the entire program at once. This approach allows for more efficient use of memory, as it reduces the amount of data in RAM and minimizes loading times for rarely accessed pages. When a page is not in memory and is needed, a page fault occurs, prompting the operating system to load the required page from secondary storage into RAM. This helps in optimizing system performance and reducing overall memory usage.