Lightning pages are the custom layouts that allow us to add custom entities to a page and are created using Lightning components. Lightning components are reusable and customizable components that are created using a combination of HTML, JavaScript, and CSS.
In the Lightning experience, an app is a collection of items, tabs, and objects organized into an interface. You can add a toolbar and a Lightning side tab to your Lightning app. Lightning Apps lets you brand your apps with custom colors and logos. You can create the app in Lightning experience from any edition of Salesforce org.
Salesforce provides various standard fields for each Salesforce objects. In every business, they use common standard fields like firstname, lastname, company name, date, amount, status, account, etc. But sometimes standard fields aren’t enough to cover the all the important information of the record. To fulfill this requirement, we use custom fields.
