What is more
Definition 1 of 1
Pro Tip 1/3Surprise Factor
Used when the upcoming point reinforces the first, often with an unexpected twist. 
She won the match easily. What is more, it was her first professional game.
Pro Tip 2/3Emphasis Addition
Adds emphasis to the following statement, indicating it's more significant than the previous one. 
The book is educational. What is more, it's extremely entertaining.
Pro Tip 3/3Argument Strengthening
Use it when you want to strengthen an argument by adding a compelling point. 
Renewable energy is sustainable. What is more, it's becoming cost-effective.