This chapter gives an overview of the field of model-based testing (MBT), particularly the recent advances in the last decade. It gives a summary of the MBT process, the modeling languages that are currently used by the various communities who practice MBT, the technologies used to generate tests from models, and discusses best practices, such as traceability between models and tests. It also briefly describes several findings from a recent survey of MBT users in industry, outlines the increasingly popular use of MBT for security testing, and discusses future challenges for MBT.