What is difference between sdlc and stlc in software testing?

Software Development Life Cycle involves the complete Verification and Validation of a Process or a Project.

Whereas Software Testing Life Cycle involves only Validation.

Software Development Life Cycle involves business requirement specifications,Analysis,Design,Software requirement specifications,Development Process(Coding and Application development),Testing Process(Preparation of Test Plan,Preparation of Test cases,Testing,Bug reporting,Test Logs & Test Reports),Implementation and Maintainence .

Whereas Software Testing Life Cycle involves Preparation of Test Plan,Preparation of Test cases,Testing,Bug reporting,Test Logs & Test Reports.