AiSDR refers to an AI-powered Sales Development Representative, a software platform that automates prospecting, research, and outreach (email, LinkedIn) to find and engage potential customers, freeing up human sales teams for higher-value tasks like closing deals. It works by finding buying signals, personalizing messages based on prospect data (like LinkedIn activity or CRM info), managing multi-channel campaigns, and even handling initial conversations or escalating qualified leads, essentially acting as an automated, always-on sales assistant.