AdSense

AdSense is an advertisement application run by Google. Website owners can enroll in this program to enable text, image, and more recently, video advertisements on their websites. These advertisements are administered by Google and generate revenue on either a per-click or per-impression basis. Google is also currently beta-testing a cost-per-action based service.

Google uses its Internet search technology to serve advertisements based on website content, the user’s geographical location, and other factors. Those wanting to advertise with Google’s targeted advertisement system may enroll through AdWords. AdSense has become a popular method of placing advertising on a website because the advertisements are less intrusive than most banners, and the content of the advertisements is often relevant to the website.

Web Widget

A web widget is a portable chunk of code that can be installed and executed within any separate HTML-based web page by an end user without requiring additional compilation. They are derived from the idea of code reuse. Other terms used to describe web widgets include: gadget, badge, module, webjit, capsule, snippet, mini and flake. Web widgets usually but not always use DHTML, JavaScript, or Adobe Flash.

Widgets often take the form of on-screen tools (clocks, event countdowns, auction-tickers, stock market tickers, flight arrival information, daily weather etc).

PHP SQL Injection

SQL Injection ?

SQL Injection is a technique which enables an attacker to execute unauthorized SQL commands by taking advantage of unsanitized input opportunities in Web applications building dynamic SQL queries.

This is due to the fact that PHP combines the strings of the MYSQL query you gave it with the variable before it so that someone could add a second query or otherwise change your MYSQL query to give them information or access that they should not have.

The most common of these unsanitized input includes unescaped quotes in SQL statements.