Accessibility: customers around the world will now be able to reach your applications 24 hours a day, seven days a week, as long as the Internet is accessible. There is no need for them to install any software on their computers. It's all done through a web browser!
Reduce business costs: you will now spend less time talking to customers over the phone taking information from them, as your clients will no be able to fill out forms and other details. Let the power of automation do most of these laborious and ineffective tasks for you.
Reduce maintenance costs: when it's time to upgrade / enhance your application, there is no need to rely on every customer to client software on every single computer. It's now all done seamlessly in the background.
Improve security of your data: the data is now centralized and in the cloud which means easy backups and security.