What is the active state of a button?
When we click a button, the active state occurs in a very short time. Actually, this state is the time interval when we interact with the button. So the active state is not the selected state. To see it more clearly, hover over the button with the mouse and click the button and stay there.
What are secondary buttons?
Secondary buttons are used for the second most important action. These are often used if you have multiple actions on a page so need more than one button. Your secondary action should be styled differently from your primary action but may use the same colours.
What are UI states?
We humans have different reactions to situations we are being faced with at any particular time so does a digital product and this reaction to user interactions is called U.I states. Depending on the context, these states are revealed to the user.