It’s always a good idea to know some basics about the operating system you’re running on your computer. For example, you may need to know whether you’re running a 64-bit or 32-bit system so you know which file to download for a program you want to install….

Source: https://www.howtogeek.com/198615/how-to-check-if-your-linux-system-is-32-bit-or-64-bit/