LIGHT:

Light is a form of energy as we know, it is not only make things visible but also has invisible speed too.Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum which is visible to the human eye and is responsible for the sense of sight.Visible light is usually defined as having wavelengths and its approximately has range of 400–700 'nanometres' between the infrared with the ultraviolet. This wavelength means a frequency range of roughly 430–750 terahertz ( THz ).

Sunlight provides the energy that plants which release energy into the living things that digest them.And also helps in the process of photosynthesis which provides virtually all the energy used by living things. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight.The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarization, while its speed in a vacuum, 299,792,458 m/s, is one of the fundamental constants of nature.Light, as with all types of electromagnetic radiation.

We also hear that some species of animals generate their own light which is called 'bioluminescence'.

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NOTE: @Sirknight started a contest and daily themes are:

MONDAY: Darkness.
TUESDAY: Animal Kingdom.
WEDNESDAY: Structures.
THURSDAY: Forces in Nature.
FRIDAY: Love Beauty Freedom.
SATURDAY: Agriculture.
SUNDAY: Light.
For more detail view his blog:
https://steemit.com/celestialchallenge/@sirknight/sirknight-s-daily-celestial-challenge-new-for-all-steemians