Q21. What is Angular Expression? Ans: Angular expressions are JavaScript-like code snippets that are usually placed in bindings such as {{ expression }} . For example, these are valid expressions in Angular: {{ 3+4 }} {{ a+b }} {{ user.name }} {{ items[index] }} Demo Q22. How Angular expressions are different from JavaScript expressions? Ans: Angular expressions are like JavaScript expressions but there are few differences. Context : In Angular, the expressions are evaluated against a scope object, while the JavaScript expressions are evaluated against the global window object. Forgiving: In Angular expression evaluation is forgiving to null and undefined, while in JavaScript undefined properties generates TypeError or ReferenceError. No Control Flow Statements: Loops, conditionals or exceptions cannot be used in an Angular expression. No Comma And Void Operators: You cannot use , (comma) or void in an Angular...