Stages of a start-up can be broadly classified as :

Ideation  Stage:  This stage is basically a Problem – Solution Stage, where entrepreneurs develop a solution to a problem faced by many. At this stage Minimal Viable Product (MVP) is developed. Simply saying, “making what people wants”.

Validation Stage: At this stage, it is ensured that MVP has achieved a good Product/Market fit. Product-Market Fit means that the product can satisfy the needs of target market.

Scaleup Stage: At this stage, the MVP is distributed to larger target market. The concept of unit economics has a lot of importance in this stage.

Maturity: At this stage, business is no longer a start-up