Inbound lead generation draws prospects to you through content, SEO, and social media they discover while actively searching for solutions - prospects self-qualify by reaching out, making them warmer and more likely to convert. Outbound involves proactively identifying and contacting prospects who haven't expressed intent - through cold email, cold calling, LinkedIn outreach, or paid advertising to cold audiences. Inbound is built primarily on content marketing and SEO - the blog posts, guides, and case studies that rank on Google and attract prospects at the moment they are actively researching a problem you solve.