A plain-language explanation
A sales lead is a person or company who has shown interest in the offer and provided data enabling further contact.
Where it helps in practice
A sales lead is a person or company showing possible interest, but not every contact is ready for a sales conversation.
The decision before implementation
Document qualification criteria, source, need, consent and next-step ownership without inventing missing data.
How to verify the result
Track response time, quality, stage movement, loss reasons and outcome by original source.