Marketing automation uses software platforms — such as HubSpot, Mailchimp, or ActiveCampaign — to automatically execute and manage marketing activities like email campaigns, lead nurturing sequences, social posting, and CRM updates based on user behavior or scheduled triggers. AI is enhancing automation by adding adaptive decision-making — dynamically adjusting send times, content variations, and audience targeting based on real-time performance data. Automation frees teams from repetitive tasks and enables consistent, scalable communication.