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Plants: Autotrophs
  
Homeby seyed mostafa zamani on Flickr

Photosynthesis is the process by which plants, some bacteria, use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the "fuel" used by all living things. 

The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. Most of the time, the photosynthetic process uses water and releases the oxygen that we absolutely must have to stay alive.
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Tadpoleby J.Armando Serrano Photography on Flickr

Every living creature needs food to survive. While most of the beings depend on others for food and energy, there are some living things that can produce their own food. These self-dependent living creatures are known as the autotrophs. And the process by which they can produce their own food and energy, using only the natural source of light and water, is called Photosynthesis.
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Green Hopeby SamuelJohn.de on Flickr

In Photosynthesis, the green colored plants use the photons present in the sunlight, to produce glucose (food) along with molecular oxygen, that we breathe.This process of photosynthesis is divided in two parts, namely light-dependent reactions (light reactions) and light-independent reactions (dark reactions). 

The light reactions, that need light to produce organic energy molecules (ATP and NADPH), are initiated by colored pigments, mainly green colored chlorophylls. 

The dark reactions make use of these organic energy molecules (ATP and NADPH). Wherein ATP provides the energy, while NADPH provides the electrons required to then fix the co2(carbon dioxide) in to carbohydrates. But even dark reactions will fail to continue if the plants are deprived of light for too long, since they use the output of the initial light-dependent reactions
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the lakeby minnesotabadger on Flickr

The process of photosynthesis is considered of utmost importance for the existence of life on our earth. Since the heterotrophs (ones who depend on others for food and energy), either directly or indirectly, solely depend on the photosynthesizing autotrophic beings.
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