A slide deck is just another way to refer to a presentation deck or pitch deck. The term was perhaps first used in Silicon Valley.
We decided to give you insight on the Perfect Pitch - How to Leave a Lasting Impression on Investors, which is what you should aim to achieve when you get up in front of VCs.
If you are an early-stage startup in the tech space and you are looking for money to grow your company, the official term is raising capital, the most commonly recommended instrument to raise funds is a convertible note. However, to understand how those work, we first need to understand how equity (or stock) works.