Why streak method used for isolation?

The streak method is used for isolating bacterial colonies from a mixed culture by diluting the sample across the surface of an agar plate. By spreading the sample with a sterile loop in a specific pattern, individual cells are separated from each other, allowing them to grow into distinct colonies. This technique is essential for identifying and characterizing specific microorganisms, as it helps ensure that each colony originates from a single cell. Additionally, it simplifies the process of obtaining pure cultures for further study.