The DSS are a rough collection of several hundred pieces of pottery and esp. papyri with Hebrew writings on them. Many of them are scriptures from Tanakh (Hebrew Bible) in Hebrew, and a bit in Aramaic and Greek. Most of the in tact writings are are polemical writings from one (or probabaly more) communities who do not seem to be part of the mainstream Jerusalem community.
People used to think they were the Essenes, mentioned in the Gospels, but the consensus has failed and most scholars are moving toward a "library" theory of the DSS, something around the Jewish revolution that led to the crushing of Jerusalem and desecration of the temple in 70CE/552BH.
Google the Open Scrolls Project and you can read some of them.