- The document discusses SerDes in Apache Hive, which are components that handle serialization and deserialization of data between Hive and Hadoop. - It introduces LazySerDe, which improves efficiency by lazily deserializing data and reusing objects, only parsing raw bytes when necessary. - Benchmark results show LazySerDe significantly reduces deserialization time compared to other SerDes by avoiding expensive UTF-8 decoding and reusing parsed objects.