2. Remember that our latest topics involve a more advanced look at how webpages work
With server-side processing, we’ll now look at what happens after you click a button to ‘submit’ data or ‘search’

3. Server side means processing data at the ‘back end’ on the web server
That’s all the nerdy work that ordinary people never think about!
It’s done using special server scripts that are written in server-side languages such as PHP
All this usually happens after you’ve done something on a webpage…

4. Client Side Internet Backbone Server Side
Example 1 – Web Form
You enter your personal details on a web form
The data is sent across the Internet
At the back-end, the data will be checked & stored
Web Server
Database
Client Side
Internet Backbone
Server Side

5. Index Client Side Internet Backbone Server Side
Example 2 – Web Search
You enter your key works in the search engine
Data is sent across Internet & later results sent back
At the back-end, the search is done using the Index
Web Server
Database
Index
Client Side
Internet Backbone
Server Side

6. Advantages
Server power: A web server is likely to be way more powerful than a client computer, so it can process data faster
No browser: Servers don’t use Browsers so there are none of the difficulties you get on the client with different brands
Efficient: Everything is done on the server, so no need to wait for downloads etc

7. Disadvantages
Security: When data is sent back from the client, it travels across the Internet where it could be intercepted by hackers
Overloading: If a lot of users are submitting data, it could overload the server and cause it to crash (eg when thousands try to book gig tickets).
Waiting time: Sending data between client & server takes time so users could be left waiting for a response