Final answer:
DNA ligase is the enzyme responsible for joining DNA Okazaki segments together during DNA replication.
Step-by-step explanation:
The type of enzyme that joins DNA Okazaki segments together is DNA ligase. During DNA replication, the lagging strand is synthesized discontinuously, creating Okazaki fragments. Once the segments are formed and RNA primers are replaced with DNA nucleotides by DNA polymerase I, DNA ligase seals the nicks between the Okazaki fragments, joining them into a continuous DNA strand.