The difference between the two comes down to protein content.
Cake Flour vs. Regular Flour
Which All-Purpose Flour Is Best?
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3 Easy Ways to Replace All Purpose Flour with Cake Flour - wikiHow
When to Use Cake vs All Purpose Flour in Your Baking
There's a Difference Between Cake Flour and All-Purpose Flour, and It Matters When Baking
What Is Pastry Flour?
The Difference Between All-Purpose Flour and Cake Flour
Cake flour vs. all-purpose flour: What's the difference, and how do I substitute?