Einstein Lead Scoring is a Sales Cloud Einstein feature that ranks each lead by how closely it matches your company's past conversions, so salespeople can work the most promising leads first. Einstein studies converted leads, builds a predictive model, and writes a read-only Lead Score onto records along with the field values that most raise or lower that score. An administrator turns it on in Setup, chooses how conversion is defined and whether to score all leads together or in segments, then waits for Einstein to finish building the model.