Describes something visually or audibly clear, fresh, or bright; often used for light, sounds, or a refreshing atmosphere. Literary and somewhat poetic.
明るい is the common word for 'bright' in everyday language; さやか is more literary and often describes a clear, refreshing quality rather than just brightness.
Etymology
The origin is uncertain; it may be related to the classical adjective さやけし (clear, bright). The kanji 明 and 清 are used for their meanings, but the word is now usually written in kana.
