Predictive Model Markup Language (PMML) is an open, XML-based standard that enables the seamless exchange of statistical and data mining models between different software applications and platforms. PMML allows models created in one system to be deployed in another—regardless of the vendor—by encapsulating the complete model specification, including preprocessing steps, model structure, and post-processing, in a standardized XML format. Widely supported, PMML streamlines the deployment of predictive analytics and machine learning models, making it a trusted format for interoperability in data science workflows.