Google offers several digital marketing certifications through its Google Ads and Google Analytics platforms. These certifications demonstrate a professional level of proficiency in using Google's advertising and analytics tools. Some of the certifications available include:

1. Google Ads Search Certification
2. Google Ads Display Certification
3. Google Ads Video Certification
4. Google Ads Shopping Certification
5. Google Analytics Individual Qualification (IQ)

To obtain a certification, one must pass a corresponding exam. The exam is usually a multiple-choice or a task-based exam, which test knowledge in using Google's tools, metrics and best practices. These certifications are valid for a period of one year and can be renewed by passing the certification exam again.