The question is probably more correctly asked as Why or when would you overexpose. It's not a time-based or frequency thing like changing your engine oil.
The following is given with the understanding that over exposure means deliberately exposing more than what the camera meter is suggesting. It does not relate to film that is so badly over exposed that it causes image wash out. On that basis, I will say you over expose when:
a) bracketing (one can choose to only over expose as opposed to doing both)
b) you know the subject lighting requires it (e.g. a subject with strong backlighting)
c) you wish to bring out shadow detail and you will compensate for the over exposure during film development
d) there is a strong point source of light that will cause normal exposure to render the rest of the picture very dark, and the nature of the light source is naturally very bright. Although similar to b) I'm thinking more along the lines of a sunrise/sunset or a person who is arc welding.
Photographs are taken in a lot of places, but often professional photos are taken in a photography studio.
Photographers often take pictures in the studio.
muscle tissue
Often photographs are prohibited in areas such as dams because of the possibility of terrorist action. Pictures will be taken as a way of "casing" an area, in order to have a visual reference.
Producers are often trying to persuade you of things that might not be good for you
You should be able to find photographs of Lipomas on the Internet. They are soft tissue cysts, often called 'fatty cysts' and they are not cancerous. They can be surgically removed but your body may grow more of them.
A 'Slideshow' means that images/photographs are displayed in a sequence with transitions & animations. Slideshows are often used to present photographs and portfolios to both family and friends as well as customers and clients.
This is most often known simply as "candlelight photography". It is basically a subset of "ambient light photography" which taking photographs by the "available" light. In other word, not adding flash or other auxilery light to the scene.
No, a JPG (or JPEG) is an image file. This is often used for photographs and other higher-detail graphics.
Large-format, often aerial, photographs of industrial sites, quarries and the like around the world.
Photographers often scout locations for photographs. They may also meet with clients and discuss photography options for events or special occasions.
Drinking, often whiskey.