WHAT'S A SERVER AND HOW IT WORKS ?

Have you ever got a doubt that where a pic or a post that you posted 5 or 10 yrs back in Facebook get stored and how we are able to read them back after many years🤔🤔.......

Simple answer for this question is that all the data/information is stored in Facebook server 

Server:

--->In general definition of server is which serves the purpose. Server in Internet language can be defined as either hardware or software which can store data and can give access to data whenever it is required.

--->Whenever we send a mail or a pic to someone who is not in online the pic or data should be stored somewhere so that it can be delivered to target person when he is in online. The data will get stored in server and it keeps a copy of the data with it and sends it to target whenever he is in online.

--->The capacity of server depends on the traffic of that particular website. Facebook has admitted that its users utilize around 7PB (PB = 1e+15 bytes) of photos storage from its facility every month. Data centers are maintained all over the world and they require continuous power supply. Google's data centers use around 260 million watts of power which account to 0.01% of global energy. This power is enough to consistently power 2,00,000 homes.

Add on :

Processed data is known as information. 

If we say 5 its data

If we say 5 Kg its an information. Any thing that has some meaning is known as information.

Server's is of 2 types

1.  Dedicated servers: Works 24 x 7 and have high end capacities and capabilities to handle traffic

2. Non Dedicated servers: Even we can make our laptops or desktops as servers by installing software's and these comes under Non Dedicated servers.

Note: Content is limited to my knowledge and comments are most welcome..🙂🙂

How Xerox machine do our tasks much simpler ?

To understand the working of a photo copier (Xerox machine), let me first explain about "PHOTO-CONDUCTOR"

~~~> The word itself says that it becomes conductor when exposed to light.

~~~>  Photo-conductivity is a electrical phenomenon where photo-conductor becomes electrically charged when exposed to light.

     Go back to your school days and remember the days when we used to rub pen caps to our hair and make the cap to attract small pieces of paper......What happens in this process is that while rubbing cap to our hair we are making cap charged with static electricity which will then attract small pieces of paper. This simple phenomenon is used in a photo-copier.

Main components of photo-copier:

1. Source of light

2. Photo-conductor mounted on a drum

3. Toner (Ink) along with developer

4. Fuser unit

Working:

 ~~~> When you place a document inside a xerox machine and press 'start' , a beam of light from light source will falls on the document at an angle. 

~~~> The light which falls on the white area of the document will get reflected back and which falls on "text or image of document" will get observed.

 ~~~> Reflected light will fall back on photo-conductor and makes it electrified based on the pattern of reflected light. The drum will then rotates photo-conductor towards the toner along with paper, where developer in the toner made the ink powder electrically charged. Thus the ink powder will get attracted to the paper as per the pattern of charge on Photo conductor.

~~~> This paper with the toner on it will pass to the Fuser unit where the toner on the paper will get heated up or pressurized to turn it into ink and made it to permanently stick to the paper.

Add-on:

Chester carlson inventor of photo copying, had a job which requires him to make large number of copies of important papers . Then he did experiments using photo conductivity and finally end up with this idea. Carlson tried to sell his invention to companies including IBM and General Electric but he was turned down. 

Note: Content is limited to my knowledge and comments are most welcome....😊