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Definition 1 of 1
Pro Tip 1/3Intensity Stressor
Emphasizes the power or degree of an action, feeling, or state, making it notable. 
The movie was so intriguing that I watched it twice.
Pro Tip 2/3Cause and Effect
Shows a clear, direct relationship between an action or state and its impact or consequence. 
She spoke so softly that we couldn't hear her.
Pro Tip 3/3Emotive Emphasis
Conveys strong emotions and can make statements feel more personal or impactful. 
He was so excited that he jumped up and down.