Can I use Linux without installing?

As already explained one of the many incredible features of all Linux distributions is the ability to boot a distribution directly from the USB stick you created, without the need to install Linux and affecting your hard drive and the current operating system on it.

Can I run Kali Linux without installing?

You should be able to use Kali Linux on newer hardware with UEFI and older systems with BIOS. Our i386 images, by default use a PAE kernel, so you can run them on systems with over 4 GB of RAM. In our example, we will be installing Kali Linux in a fresh guest VM, without any existing operating systems pre-installed.