External sound cards pretty much work in the same principle as your internal audio card or the one that’s on the motherboard. They are capable of producing audio from the data transmitted by the processor. The only difference is they are mobile. An external audio card just needs to be connected via a USB cable for it to work.
An external audio card would come in handy when you want to have better audio quality for your laptop but space and temperature conditions doesn’t allow high-end internal sound cards. The good thing about getting a separate audio card is that this one is mobile. You can transfer it to another computer. Just make sure that you get one that has a plug and play functionality.
Just like with your internal sound card, you need to assess what you use the computer for before getting an external sound card. Usually, this audio card is used by movie buffs or music enthusiasts so if you’re the type who only does simple word processing on the computer, you may want to rethink getting your own external audio card.
External sound cards typically get connected via a USB port in the computer so it goes without saying that you need to make sure that your computer has enough slots to accommodate your sound card as well as the other peripherals that you have. Another thing to keep in mind is that you also need to make sure that your computer is properly updated. Just like the internal sound card, you may need to upgrade on your system so the external audio card can produce good audio quality.