What is the difference between pre seed and seed phase

Below are some high-level definitions with ranges. Please note that the metrics vary by region and sector.

Pre-Seed
Traction: Idea -> Early Signal of Product-Market Fit
Product: Prototype -> Customer Product usage
Team: Founders -> Core Founding Team
Revenue: No Revenue -> First Paying Customers/Pilots

Seed
Traction: Paying Customers -> Product-Market Fit with Core Customers
Product: Early User Retention -> Growth in Product Usage
Team: Core Founding Team -> First Employees 
Revenue: First Paying Customers/Pilots -> Expanding Customer Base

IMO Pre-Seed is the first institutional round, with the Angel Round before that.  I wrote a detailed blog about this as well as a Twitter Thread.  My stage definitions(as of mid 2023). the bar has gone up in the last 12 months for each stage.

Angel:

Pre-revenue

Pre- product, ideation maybe wireframe

raising < $0.5 M

valuation <$6M post-money

Pre-seed:

Early revenue, $50K+ ARR

Product in the market for > 3 months

raising < $500K-$2M

valuation <$10M post-money

Seed:

~$500K+ ARR

Material customers, good logos, pipeline

raising $2M - $5M

valuation <$25M post-money