This chapter mainly discusses the management of schemas and users in PostgreSQL and explains the key differences between a schema and a user and how to create and manage them using authentication and privilege management with support of roles and privileges. Also, this chapter illustrates different ways on how a user can connect to the PostgreSQL database both from within a database server and from a remote host. After reading this chapter, you will understand the authentication methods defined in PostgreSQL and options to use when connecting to PostgreSQL databases.