What are the two types of apps in Salesforce?
Salesforce.com has two types of apps that you can install: Classic and Lightning. Classic apps are the apps that have been around the longest. Lightning apps are the newest apps. The advantage of Lightning apps are that you can design them on the screen according to your requirement. The advantage of Classic apps is that you can always access them even when you do not have access to the Internet. Both kinds of apps may be modified to fit your users’ working styles.