What Is Lead?

A lead is a person or company that has shown potential to become a customer and whose contact information is available for sales or marketing to act on. The term covers a wide spectrum of quality and intent, which is why qualification stages exist: a raw lead may be nothing more than a name and email matching your target profile, while a marketing qualified lead (MQL) has engaged with your content, and a sales qualified lead (SQL) has been vetted as having genuine fit, need, and intent. In outbound work, a lead usually means a contact on a built list - right company, right title, verified email - before any interaction has occurred; in inbound work, it means someone who took an action like filling a form. The definitional looseness is commercially important: when a vendor sells leads, the buyer must pin down which definition applies, because a verified contact, an engaged prospect, and a booked meeting differ in value by orders of magnitude.

Lead in Practice

In practice, teams operationalize the word by stage. A common ladder: contact or prospect (matches ICP, no interaction), engaged lead (replied, clicked, or attended something), MQL (crossed a marketing engagement threshold), SQL (qualified by a human against criteria like BANT), opportunity (active deal in pipeline). Each handoff has an owner and a conversion rate, and funnel math runs on those rates - if 1,000 outbound contacts produce 40 replies, 15 qualified conversations, and 5 opportunities, each stage rate is a lever that can be tested independently. The definitional question matters most at commercial boundaries. Pay-per-lead arrangements collapse or succeed on the written definition of a billable lead: a lead-gen provider counting form fills gets paid for volume the client's sales team may find worthless, while a provider paid only for meetings held with ICP-matching decision-makers is aligned with revenue. The common mistake inside companies is the same dispute in miniature: marketing celebrates lead volume, sales dismisses lead quality, and nobody has written down what a lead actually is. A one-page definition agreed by both teams - profile criteria plus required action - dissolves most of the argument.