The 7 Chakras are the spiritual energy centres within the body.
Vishuddha is the throat chakra, related to the colour blue.
It represents our ability to communicate.
Here are some great asanas to balance the Vishuddha chakra:
Bhramari breath
Marjaryasana
Setu Bandha Sarvangasana
Ustrasana
Bharadvajasana
Salambha Sarvangasana
Halasana
Eka Pada Sarvangasana
Karnapidasana
Matsyasana
Viparita Karani
Savasana