"Chakra" comes the Sanscrit word meaning "wheel" and when translated from Hindi it literally means "wheel of spinning energy". So, chakras are perpetually spinning wheels of energy (or energy centres). They are the piece of us that feels a gut intuition, and the energy within us that connects, moves, and creates our being.
We have 7 primary chakras in our body which run up the spine, one by one, from the base of the spine to the top of the head. As they run in a line, they influence and impact each other. Therefore, if there is a block in any one of the these chakras, the other chakras will feel its impact.
When, however, our chakras are in balance, open, and the energy is running through them, unhindered, our whole being feels healthy and in alignment.