Account-Based Marketing (ABM) is a B2B strategy that treats high-value accounts as individual markets. Instead of generic campaigns sent to thousands of leads, you identify 50-500 target accounts (prospects matching your ideal customer profile), research decision makers, and run coordinated marketing and sales campaigns tailored to each account. Marketo (Adobe Marketo Engage) is the leading ABM platform. It provides: account selection and prioritization, person matching (linking contacts to accounts), personalized content and landing pages, email sequencing, engagement scoring, and ROI measurement.