Glossary

Filter by alphabet (A–Z) or browse all terms.

Batch

A Y Combinator batch is a cohort of startups that go through the program together. Batches are typically named by season and year (e.g. Winter 2026, Summer 2025). Browse on this site →

YC

Y Combinator is a startup accelerator that invests in early-stage companies and provides mentorship, funding, and network. Companies in this directory have participated in YC. Browse on this site →

Demo Day

At the end of each batch, YC companies present to investors. Demo day is a key milestone for raising follow-on funding.

Industry / Tag

Companies are tagged by industry or category (e.g. SaaS, AI, healthcare). You can browse by industry to find companies in a specific space. Browse on this site →