What was before the Lightning Experience?

If you noticed, we mentioned the term classic user interface in the Let's get the right term section. Yes, that is the one--Salesforce Classic had been serving well for many years before Lightning Experience was introduced. Salesforce Classic still exists, and is widely used by many customers, but mostly, the new features introduced by Salesforce in recent releases are only applicable for Lightning Experience.

If you are still with Classic, Salesforce urges you to migrate to Lightning. Why do I use the term migrate? Because the user interface is totally different, and some of your existing customizations may not work, such as the JavaScript button built by your Salesforce partner or your IT team. You should consult with your Salesforce Success Manager, partners, or IT before making the decision.

Because the user interface is totally different from Classic, your user manual, training video and material, and so on, need to be updated, so plan this journey with proper project management to roll out Lightning Experience.