This chapter focuses on keeping our data secured so that only those that need to read from or write to it have access. Because security is a huge area to cover, in this chapter, we will talk about some basic concepts to get a general background on the options we have in Kafka. Our goal in this chapter is not to set up security, but to learn some different options that you can talk with your security team on researching in the future and get familiar with the concepts. This will not be a complete guide to security in general, but sets the foundation for you. We will discuss practical actions you can take in your own setup, and we will look at the client impact, as well as brokers and ZooKeeper, to make our cluster more secure.