What are aggregates and how are they used in CQRS (Command-Query-Responsibility-Segregation) and ES (Event-Sourcing)? I'm new to this kind of architecture, and I'd be really happy if someone could please explain this to me. Thanks!
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First I'd like to quote Martin Fowler's blog post on CQRS and note that Aggregates are rather related to Domain Driven Design then to CQRS.
In terms of Domain-Driven Design Aggregate is a logical group of Entities and Value Objects that are treated as a single unit (OOP, Composition). Aggregate Root is a single one Entity that all others are bound to.