The object in the image is a microphone isolation shield, also known as a reflection filter or acoustic screen.
It is designed to improve the quality of recordings by:
Reducing unwanted noise: It minimizes room reflections and echoes, preventing them from being picked up by the microphone.
Improving direct sound: By creating a more controlled acoustic environment around the microphone, it helps capture a cleaner and more focused sound.
Portability: Many models are lightweight and designed for easy setup and transport, making them suitable for both studio and on-location recordings.
Compatibility: They typically fit onto most standard microphone stands and can be used with various microphones.