Salesforce - Apex - Static vs. Non-static explained in 5 minutes | Static Variable and Method
What is Static in Salesforce Apex?
What is Non-static?
What is the difference between Static and Non-Static?
How to create static variables and static methods in Salesforce Apex?
When to use static variables and static methods?
When to use non-static or instance variables and methods in Salesforce Apex?