Is a Samsung portable SSD T7 shield an external hard drive?

Not sure if I am at the right spot but I’m hoping someone can help me here. I am trying to free up some room on my PC by moving photos to an external hard drive. I have used a Seagate external hard drive before and worked great but needed a bigger one. Went to Staples (I know, it’s all that is around here) and clerk sold me the above Samsung SSD 7. It isn’t acting like an external hard drive. What is it for?