Liferay primarily supports Java for application development. Developers can use Java and various frameworks like Spring to create custom themes, plugins, and portlets. Liferay supports JavaScript, CSS, and HTML for front-end development and customization.

Liferay allows you to extend its functionality through plugins. There are three main types of plugins: Portlets, Themes, and Hooks.

Yes, Liferay is suitable for building mobile applications. Liferay provides responsive design capabilities. It indicates that Liferay portal user interfaces automatically adjust to various devices, such as smartphones and tablets. Additionally, Liferay's APIs and web services support enable seamless integration with mobile applications.

Liferay-based applications can be deployed in various environments:

1. On-Premises Deployment
2. Cloud Deployment
3. Liferay DXP Cloud