Please find the information below from stack exchange community for similar question as above.
Salesforce Classic: It's the platform which we are using from long time as standard, Salesforce just named to classify between the new User Interface/Experience and old User Interface/Experience.
Lightning Experience: It's the new, slick user interface and the Lightning Component framework is an UI framework for developing dynamic web apps for mobile and desktop devices. Lightning makes it easier to build responsive applications for ANY DEVICE. The initial release of the new user interface is geared towards sales reps with an intuitive interface that allows sales reps to work more efficiently. The dashboard and charts in Lightning Experience behave much like Wave where changes in the chart recalculates in real time. While the new interface is easy to enable, It may not be suited for everyone as there are some missing functionalities at this point of time. In the future releases salesforce would eliminate those gaps, but keep safe harbor statement in mind.
Please find the information below from stack exchange community for similar question as above.
Salesforce Classic: It's the platform which we are using from long time as standard, Salesforce just named to classify between the new User Interface/Experience and old User Interface/Experience.
Lightning Experience: It's the new, slick user interface and the Lightning Component framework is an UI framework for developing dynamic web apps for mobile and desktop devices. Lightning makes it easier to build responsive applications for ANY DEVICE. The initial release of the new user interface is geared towards sales reps with an intuitive interface that allows sales reps to work more efficiently. The dashboard and charts in Lightning Experience behave much like Wave where changes in the chart recalculates in real time. While the new interface is easy to enable, It may not be suited for everyone as there are some missing functionalities at this point of time. In the future releases salesforce would eliminate those gaps, but keep safe harbor statement in mind.
2) Also, you can get a good knowledge about the Qualification of ORG to be with Lightning Experience from Trailheads - Does My Org Qualify for Lightning Experience?(https://developer.salesforce.com/trailhead/en/lex_migration_introduction/lex_migration_introduction_rightforme)
3) Also an Interesting read about this comparison also here - Salesforce Classic or Lightning?(http://www.absi.be/salesforce-lightning-or-classic/)
4) Comparison chart on - Lightning Experience VS Salesforce Classic(http://advancedcommunities.com/lightning-experience-vs-salesforce-classic/)
Mark this as solved if the information helps.
Regards,
Nagendra.