What is Difference Between Prospect and Lead in Salesforce ?

 A lead is a top of the funnel, unqualified contact. Leads have typically expressed some level of interest in your product or offering, but have not been qualified to determine if they fit the ideal buyer persona or would benefit from using the product. A prospect is a contact who has been qualified as an ideal customer who would consider buying 

see this as well - https://trailhead.salesforce.com/content/learn/modules/lex_salesforce_tour/lex_salesforce_tour_sales

  Pls mark answer as best one if it helped you in anyway