Do I really need an audio interface?

Yes, you do need an audio interface to record music into your computer. The Bwhringer USB mic you refer to is essentially an audio interface with limited features built into a microphone. A standalone interface will give you more options especially if you want to use different mics.

Do audio interfaces improve sound quality?

In addition to expanding your inputs and outputs, audio interfaces can also greatly improve the sound quality of your computer. Every time you record new audio or listen through speakers and headphones, the audio interface will reproduce a more accurate representation of the sounds.

Behringer U-Phoria UM2 Audiophile 2x2 USB Audio Interface

Behringer U-Phoria UM2 USB Audio Interface | Reco Music Malaysia

Behringer U-Phoria UM2 Audiophile 2x2 USB Audio Interface

RM190.00

Quantity

That's why Behringer U-Phoria UM2 kicked things up a bit with the U-PHORIA Series USB Audio Interfaces. With 4 unique models to choose from, the U-PHORIA Series has the ideal interface to make your recording experience legendary. 48kHz, 2-channel USB Audio Interface with 1 XENYX Preamp, Phantom Power, and Instrument Input

Features :

2x2 USB audio interface for recording microphones and instruments
Audiophile 48 kHz resolution for professional audio quality
Compatible with popular recording software including Avid Pro Tools*, Ableton Live*, Steinberg Cubase*, etc.
Streams 2 inputs / 2 outputs with ultra-low latency to your computer, supporting Mac OS X* and Windows XP* or higher
State-of-the-art, +48 V-powered XENYX Mic Preamp comparable to stand-alone boutique preamps
Powerful Phones output with Level control and Direct Monitor select
Status, Signal and Clip indications for perfect overview
USB port for connection and power
Free audio recording, editing and podcasting software plus 150 instrument/effect plug-ins downloadable at behringer.com
Designed and engineered in Germany