What is the best description of "Dhyana"?

Dhyana is best described as meditation or focused thought, as it is a fundamental aspect of yoga practice that emphasizes the importance of stilling the mind to achieve mental clarity and inner peace. In the context of yoga, Dhyana represents a state of deep contemplation and mindfulness, where practitioners direct their thoughts inward and cultivate awareness. This meditative process is crucial for connecting with one's inner self and achieving a sense of tranquility, making it an essential component of spiritual growth and overall well-being.

The other concepts relate to important aspects of yoga practice but do not capture the essence of Dhyana. Enhancing flexibility focuses on the physical postures (asanas) rather than mental focus. Breath control is linked to pranayama, which is a different practice concentrated on regulating breath. Ethical practices pertain to the Yamas and Niyamas, which guide behavior and mindful living, but do not specifically describe the meditative aspect of Dhyana. This distinction highlights why the correct answer effectively encapsulates the meaning of Dhyana within the broader framework of yoga.