Drupal module consists of a file that contains a specific function and is written in PHP. Code modules execute in the site, to access these functions and each of these modules can be created and tested independently, to perform various functions needed on the site.
Custom modules are created by the developer. Drupal web developers should normally be able to work with the APIs, AJAX, forms, etc., and is able to keep the project on drupal.org.
They should do so by following all the standards of coding and writing secure code that security can not be compromised easily. Apart from the development of Drupal modules for functions specific address of the site, Drupal development services also include consulting, choosing the right theme and maintenance of software, upgrades and version migration.
There are three very important components to create software which is good and useful work. Scalable architecture, agile development and deliver a user experience is very interesting and refreshing all the important functions to be done to get the right projects. There is always a gap between ideas and execution and implementation.
Agile development is a very important aspect of this development, where developers design the function and then returned to the client in a short time interval, so that the entire development process is based on the execute bit, the correct understanding and move to the next bit. In this way test and develop side by side is a great way to transform ideas right from the client to the code works.