  With the increasing sophistication and sheer number of cyberattacks, more and
more companies come to the conclusion that they have to strengthen their
cybersecurity posture. At the same time, well-educated Information technology
(IT) security personnel are scarce. Cybersecurity as a service (CSaaS) is one
possible solution to tackle this problem by outsourcing security functions to
managed security service providers (MSSP). This chapter gives an overview of
common CSaaS functions and their providers. Moreover, it provides guidance
especially for small- and medium-sized businesses, for asking the appropriate
questions when it comes to the selection of a specific MSSP.
