A Burqa is a piece of clothing. It is worn by some Muslim women. They can wear it as an outer garment. It only leaves a semi-transparent mesh in front of the woman's eyes, so she can see. The rest of the body is covered by it.
Other garments for Muslim women that cover less of their body are the hijab and the niqab. People often confuse the hijab and the niqab and call it burqa instead.