What is a Lead?
A lead is someone who has shown enough interest in your product or service that it is worth paying attention to, but who has not yet been assessed or accepted into your active sales process. They might have filled out a contact form, downloaded a resource, attended a webinar, or simply been introduced through a referral. The defining feature of a lead is that potential exists - but it has not yet been confirmed.
The word “prospect” is often used interchangeably with “lead,” though some teams draw a distinction: a prospect is a lead that has been minimally vetted (they fit your target profile), while a lead is anyone who has expressed interest, regardless of fit. Whatever terminology your team uses, the important thing is to define it clearly so everyone is working from the same understanding.
Why the distinction between leads and deals matters
Treating every incoming lead as an active opportunity is a fast path to a cluttered, unreliable pipeline. A deal (or opportunity) represents a specific potential sale that a rep is actively working. A lead, by contrast, has not yet earned that status - it still needs to be qualified. Keeping leads separate from deals lets you maintain a clean pipeline that reflects real, vetted opportunities while still tracking and nurturing the broader pool of interest coming in.
This distinction also helps with forecasting. Deals in the pipeline carry weighted revenue estimates. Unqualified leads do not, and mixing them together makes revenue predictions unreliable.
How leads become deals
The journey from lead to deal goes through a qualification step. A rep (or sometimes an automated workflow) reviews the lead and asks a set of questions: Does this person or company match the profile of customers you can actually help? Do they have a problem you solve? Is there a plausible budget and a real decision-maker involved? If the answers are yes, the lead is qualified and converted into a deal in the pipeline, usually assigned to a stage like “Qualified” or “Discovery.”
If the lead does not qualify, it is typically marked as disqualified with a reason recorded. That data is useful: patterns in why leads do not qualify can inform marketing, positioning, or where the team is spending time on poor-fit outreach.
For a practical guide to this process, see lead management and the guide to lead management. For the marketing-side distinction between types of leads, see MQL vs SQL.