The process of capturing an object's image on a light-sensitive material using light or associated radiation is known as photography. 

The word was originally used in the 1830s and is derived from the Greek words photos ("light") and graphein ("to draw").

The visual medium of photography dates back to the 1800s. Since then, its form, function, technology, and expression have all changed. 

The art of photography has many facets and is always changing. 

This article will discuss the definition of photography, how it is made, the mediums that are used, and several applications for photography.

APERTURE 

The opening in a lens that allows light to pass through is called its aperture. 

A certain amount of light is allowed through the camera aperture when the shutter release button is pressed to take a picture. 

The camera aperture opens to the predetermined width.

ISO

After light enters the camera lens opening, it is either captured by a sensor in digital photography or by light-sensitive film stock in film photography.

 ISO measures the sensitivity of the camera's digital sensor or film stock to light.

SHUTTER SPEED 

Shutter speed is the third element of the exposure triangle. It refers to the length of time the camera shutter remains open to let light in, usually measured in milliseconds to minutes.

An image can be created (through various processes depending on the medium) once these exposure components pass light onto a sensor or film stock. Film stock is processed chemically, whereas digital photography is—you guessed it—processed digitally. To better grasp the parallels and discrepancies among these various photography formats, let's examine them in more detail.

DIGITAL PHOTOGRAPHY 

Digital photography is the process of taking pictures instead of film by utilizing an electronic sensor to capture light. 

These photos are then conveniently transferred as digital files after being digitally stored on a memory card. 

For those who value instant feedback while shooting, digital photography has an advantage over film photography in that it can be reviewed instantly. 

Since there is no need to physically process film stock, digital photography is also less expensive to process.

 Finally, because digital photography uses digital memory cards for storage, it can take more pictures. 

ART PHOTOGRAPHY 

Even though it has many subcategories, art photography is a kind of photography meant to express itself through images.

 The photographer may use this to convey a notion they would like to investigate, tell a story, create an abstract image, or simply capture a scene from the natural world, like this famous shot by Ansel Adams.

DOCUMENTARY PHOTOGRAPHY 

Some photographers employ the technique to record actual occurrences and subjects. This kind of photography is known as documentary. Documentary photography frequently records events or subjects objectively while simultaneously capturing the narrative as it develops.

COMMERCIAL PHOTOGRAPHY 

Lastly, commercial photography is the application of photography to advertise a product, service, business, or occasion that customers can buy tickets for. Persuasion is the goal for which it is employed. Examples of commercial photography include food, fashion, and product shots.