A SOC 1 Report (System and Organization Controls Report) is a report on Controls at a Service Organization which are relevant to user entities’ internal control over financial reporting. The SOC1 Report is what you would have previously considered to be the standard SAS70, complete with a Type I and Type II reports, but falls under the SSAE 16 guidance (and soon to be SSAE 18).
Please see the following articles discussing the SSAE 16 guidance and additional information related to the SOC 1 (Type I and Type II) Reports:
In addition to the SOC 1 report which is restricted to controls relevant to an audit of a user entity’s financial statements, the SOC 2 and SOC 3 reports have been created to address controls relevant to operations and compliance and will be discussed in further detail in the future.
Please see the SOC 1 Reporting Guide page for additional information.