The main difference between pre-seed, seed, and Series A funding is the amount of money involved. Pre-seed funding rounds are typically smaller in size compared to seed rounds, averaging around $50k. Seed rounds are larger and range from $100k to $5 million. Series A rounds are even bigger, with an average of around $3 million. The stages of startup funding also differ in terms of what they provide: pre-seed provides resources for entrepreneurs to get started on their concept; seed focuses on validating the idea and building a professional team; and Series A provides more significant funding for scaling up quickly.