SDLC;software development life cycle.it consists of the 
developement process of a software from planning phase to 
maintainence phase.eg: waterfall model,v model,spiral model 
etc.

STLC is the software test life cycle.consists of test 
plan,writing test cases,test case execution,defect tracking 
and report generation.

HI, Deepa i don't agree with yout SDLC ans, what you have 
explained is different types of methodology.
SDLC: there are 7 diffrent phases of SDLC.
- Information gathering,(Business analyst get the info. 
from customer or end-users)
- Infomation anyalysis, (BA review the info and decide 
time, deadline, human resource, cost)
- Design, (then technical people start design the 
application)
- Coding, ( after design phase developer start coding 
according to the BRS)
- Testing,( Once testers get the build they start testing 
the build according to the BRS)
- Implematation, ( once tester are done tesing it goes to 
implemantation means production environment and in the 
production environment Users checks the application, (we) 
tester call as UAT -User acceptence testing and accept it)
- Maintenance. ( Last phase is maintanace, any problems or 
change request after the application is under the 
production, that's call maintenance)

STLC: there are four phases of STLC.
- Requirement( tester gather the requirements from BRS or 
FRS)
- Test Plan ( start writing a test plan according to the 
FRS)
- Test Execusion ( Execute the tests and evalute the result)
- Defect ( Log the defect find during the execusion)

yeah ,actually i meant the same but didnt write it 
properly.thanks for the detailed ans soni.

SDLC means Software Development Lifecycle
STLC means Software Testing Life cycle
First we discuss what is SDLC and What are the requirments 
is thr in SDlc?
SDLC meand Software Testing Lifecycle .SDLC is devided in 
five types 1.analysis phase
           2.design phase
           3.coading phase
           4.testing phase 
           5.release and maintaince
analysis phase:at this time the customer will analyse 
1)cost of the project
2)Wht is the project
3)wht is benfits are thr in this project
4)benfits or advantages using this software
5)Identify the project
6)Identify the scope of the project
Note:At the same time the development company is also 
analyse what is the project,which technolagy use this 
software ,agrement with development company customer during 
this project.
As part of analysis reviews are condycted
NDA (Non Disclosive agreement):
                It is fallow some rules & regulations
SLA(service Level agreement):
                this agreement fallow requirment providd by 
the customer
BRS(Buisiness reuirment Specification):
this phase is reviewed by the buisiness analyst.this review 
contains all the buisiness requirment of the document.NDA 
and SRS are conducted by the test lead.BRS document reviwed 
by the buisiness analyst.
project plan:This document contain shedule of the 
project.this can reviwed by project manager
FRS:(Functional Requirment Specification):This document can 
be reviwed test lead or project manager.
SRS: This document contain all the software and hardware 
requirments
after reviews designing phase

Designing Phase:

   after analysis phase webdesigners design the project 
according to the customer requirment

coading:
         after designing phase the developers should wrtite 
the coding

testing: 
         after coding test engineers are test the project 
according to the customer requirment.functionality is 
working or not.

Release and maintaince:
                 after testing the project is released to 
the customer
                  this is SDLC
and then STLC
STLC means software testing lifecycle:
these are the steps are involved in the stlc
plan 
analysis
 design
 coading
testing
release and mantance

Thanks mam  Sunithayagnamurthy really i don't know the
complete information about the Project "thanks for giving me
such a good information"

All, very interesting comments and answers. Soni is right 
in her answers and I can see that Moni also knows the 
correct answers.

Mu comments here are regarding the quality of the language 
or lack thereof in the various answers I see here. If all 
of you concentrate a little more on the quality of 
language, spelling and the way the answers are articulated 
and communicated, you all will go a long way and be 
successful. Good luck to all of you