What is SDLC?

Getting the problem, analyzing the problem, thinking about its solution & scope, searching for its algorithm to have a digital solution, gathering all the possible solutions, Hiring of skilled workers develop the system....

Do what you do best and outsource the rest

Basically, the licit assenting involving an exchange of services and payments is outsourcing. The strategic use of outside wherewithal to perform activities conventionally managed by internal staff is outsourcing.