Business and Data services. Many companies in the world today demand to do business with each other overprotected and private networks. the Web application model, like many software development models, is built upon 3 tiers: User Services, Business Services, and Data Services. This model separates an application into a network of consumers and suppliers of services. The web has developed from a static medium into a standard user interface technology for a developing class of interactive information ways. Up to date information and effective user interfaces are the main requirements of each web application. Methods for presenting dynamic content on-the-fly in response to user requests were developed to meet the demands of Web service applications.

IOS is an open-source, cross-platform, object-based scripting language for compelling Web applications. Versions of PHP run on several operating systems and Web servers, and interfaces are accessible to multiple database systems. PHP is available for Windows operating systems, but since ASP is usually the preferred option on Windows systems, PHP is most common on Linux systems running Apache. The PHP syntax includes elements borrowed from C, Perl, and Java. The portability of PHP can be useful if an application wants to run on several platforms or web servers.

The open source combination of Linux, Apache, MySQL, and PHP, commonly assigned to as LAMP, is gaining interest as a low-cost platform for Web applications.

Web application development with PHP quite like other complementing technologies involves defining the site and concepts of services, developing the web application structure, visual design and testing, production and Quality Analysis, usability test and industry analysis.

Android, a software platform and operating system for mobile devices developed by Google and the Open Handset Alliance, is the latest fashion of the Mobile application development industry. It allows developers to write managed code on Java-based language that utilizes Google-developed Java libraries.

The excellent built-in characteristics of the Android Software Development Kit provides tremendous flexibility and opportunity to develop diverse smart mobile applications, providing the opportunity to cash in for not only technology companies but also individual entrepreneurs from various industries and aspects, be it pharmaceuticals, sales force automation, entertainment, games, location-based services of or any sort of utility applications. The opportunity and possibilities are unlimited with Android custom application as it does not distinguish between the phone’s core applications and third-party Applications.

Symbian OS is an open source operating system for mobile phones fundamentally used on Nokia advanced or data-enabled smartphones.

It is a mobile operating system (OS) targeted at mobile phones that allows a high-level of combination with contact and personal information management (PIM) functionality. Symbian OS unites middleware with wireless communications by an integrated mailbox and the integration of Java and PIM functionality (agenda and contacts). The Symbian OS is open for third-party construction by free software vendors, enterprise IT departments, network administrators and Symbian OS licenses.