Unique identifiers are critical components in software systems, serving as the foundation for data management, distributed architectures, and secure API design. While UUIDs (specifically UUIDv4) and integer IDs have been widely adopted, ULIDs (Universally Unique Lexicographically Sortable Identifiers) are increasingly recognized as a superior choice for modern applications. This article explores the technical distinctions between these identifiers, focusing on performance in .NET ecosystems a...