Putting data from phone on a device

Pawtucket RI

Description

I’m not a wiz with cell phones..I have a free phone and I’m upgrading the SIM card...Before I take it out, can I put everything on a device of some sort so I have it??? I seen these little things you plug into the phone and it stores everything to free up space on your phone or whatever...I don’t know what it’s called so I need help...Thank You