Can we use External Hard with Laptop

[BillGold]

Hello, all I am curious to know can we connect an external hard drive to an HP laptop...? I am actually looking to run multiple OS so I thought using an external drive will be an ideal way...

 

[davehc]

I am using a couple constantly for backups.
Later:
Just wanted to add. These are both SSD's, used with Caddy's