Vector databases are designed to store and query high-dimensional vectors, which encode complex information such as text or image features. These databases play a crucial role in AI applications like e-commerce product recommendations, content discovery platforms, and natural language processing tasks. SingleStore is a distributed relational database with built-in vector search capabilities, allowing developers to combine vector search with SQL queries, making it suitable for large-scale vector data operations. On the other hand, pgvector is a PostgreSQL extension that enables native vector operations, including exact and approximate nearest neighbor searches, and supports multiple indexing methods such as HNSW and IVFFlat. The choice between SingleStore and pgvector depends on the specific use case, with SingleStore being ideal for large-scale distributed datasets requiring high performance and scalability, while pgvector is more flexible and suitable for smaller scale vector search applications or projects that need to combine full text search and traditional relational queries in the same database.