Client side processing

Client side processing is the use of scripting language to create code that provides interactivity on web pages. The important point is that the interaction takes place within the web page and the code is downloaded to the user’s computer when the web page is opened by the user’s browser.

A good example of client-side interaction is a roll over (often called a mouse over) , where some code is triggered when you move the mouse over a particular part of the webpage. This might be something simple like the display of a advertisement, or it could be a demand for some data entry (e.g. filling in your details on a social networking website).

Advantages	Disadvantages
Speed: the interaction may be faster once the code has been downloaded with the page.	It is browser specific: Not all scripts work the same way on all browsers, so you may have to create different versions depending on the browser used.
Security: It is more secure ( than server-side processing) as all the action takes place in the downloaded page as noting comes for the browser, which could cause problems like security or corruption.	Computer speed: it can be affected by the speed of your own computer.  As all of your activity is taking place on a downloaded web page, the speed of the download and the speed of processing will depend on your computer system. if the processing is complex or resource hungry, it may run slowly or cause other programs to run slowly on your system.

 Server-side processing involves the use of scripts that reside and are run on anoter computer on the internet. Information is submitted to a server, which processes it to provide results in the form of a webpage.

A good example of server-side processing is the submission of a search through a search engine. The search engine matches the word or phrase against an index of websites content on the web server using scripts.

Client-side scripting generally refers to the class of computer programs on the web that are executed client-side, by the user's web browser, instead of server-side (on the web server).^[1] This type of computer programming is an important part of the Dynamic HTML (DHTML) concept, enabling web pages to be scripted; that is, to have different and changing content depending on user input, environmental conditions (such as the time of day), or other variables.

Benefit	Disadvantages
Efficiency: Complex code may run more efficiently.	Security: The exchange of data over the network me present security risks.
Browser independent: The code is browser independent, so it can be run on any web browser.	Overloading: A server need to be able to cope with large volumes of users.
Speed: Performance is affected by only the speed of the web server.

Why is it important to Mrs Bryant whether the BTEC the Online World exam is client-side or server-side?

It is important because it might be running slow so mrs Bryant would have to get us here early and start the exam early if it is not working properly. We might need to take time to download the exam if it is client-side processing. The server has to be up to date.

Client-side scripts are often embedded within an HTML or XHTML document (hence known as an "embedded script"), but they may also be contained in a separate file, to which the document (or documents) that use it make reference (hence known as an "external script"). Upon request, the necessary files are sent to the user's computer by the web server (or servers) on which they reside. The user's web browser executes the script, then displays the document, including any visible output from the script. Client-side scripts may also contain instructions for the browser to follow in response to certain user actions, (e.g., clicking a button). Often, these instructions can be followed without further communication with the server.

Source- wikipedia