How to Add Swap Space on Ubuntu 20.04

Swap Space is a space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, swap space let you store additional information. Swap space can help machines with a small amount of RAM. In case you choose a VM instance with 600 MB RAM, then your memory will get exhausted and you will get an error because your server cannot allocate sufficient memory.