• jQuery are good for cross-browser inconsistencies
• IE8 internet explorer 8
• scripts : series of instructions
• a browser may use different parts of the scripts depending on how the user interacts with the web page.
• undefiend is a datatype.
• (%) operator : divides two values and returns the remainder 10 % 3 = 1
• if you use arithmatic operator on string –> NaN

fUNCTIONS

• A group of series statments togather to perform a specific task
• you can reuse the function by calling.
• why we use it ?
  • to repeat the same statments multiple time.
• you can call the same function as many times as you want within the same JavaScript file.
• return to return a value to the code that called the function.