A digital marketing manager is responsible for developing, implementing, and managing marketing campaigns that promote a company's products and services through digital channels such as email, social media, websites, and mobile apps. Some of the key responsibilities of a digital marketing manager may include:

1. Developing and implementing a digital marketing strategy
2. Managing the company's social media accounts
3. Tracking and analyzing website traffic and metrics
4. Creating and executing email marketing campaigns
5. Developing and managing online advertising campaigns
6. Managing the company's online presence and brand reputation
7. Developing and implementing search engine optimization (SEO) strategies
8. Coordinating with the marketing team to develop content for the company's website and other digital platforms
9. Collaborating with design and technical teams to develop and maintain the company's websites
10. Analyzing and reporting on the effectiveness of marketing campaigns

A digital marketing manager should have a strong understanding of the various digital marketing channels and technologies, and be able to use data and analytics to measure the success of their campaigns and identify areas for improvement. They should also have strong communication and collaboration skills, as they will often be working with a team of marketing professionals, as well as with other departments in the company.