Diff between STLC & SDLC

STLC
1. Preparing the test plan
2. Creating the test environment
3. Writing the test cases
4. Creating test scripts
5. Executing the test scripts
6.Analysing the results and reporting the bugs
7. Doing regression testing
8. test exiting

SDLC

1.Project initiation
2.Requirement gathering and documenting
3.Designing
4.Coding and unit testing
5.Integration testing
6. system testing
7. installation and acceptance testing
8. support or maintenance