Can someone describe functional testing and integration testing?

Im game testing like FB games, now I want to upgrade my testing ability by doing web testing,
Can someone provide an example of:
login like yahoo mail.

or much detailed test case for web application.

and how to provide a test script?does it need a application first(e.g. qtp,selenium)? or it can be done manually?

List out some of the examples of integration and system testing?

I saw couple of answers on the diff b/w jira and bugzilla but they were not satisfying.Kindly provide the relevant answer.

What are the possible scenarios to choose that an application can be manually tested or Automated?
Give an example for a Stand alone application and Web Based Application.

What Can be the side effects of Using Automation Tools while Testing ?
Explain some observation that to be kept in mind while testing.

List any tools for WLAN Automation Testing, How will you write Automation script for WLAN Automation?

Your Team is building Software for Transactional Banking.
It is Critical that if an unexpected event occurs, the software does not fail or suffer any loss of data. Based on the scenario above, which type of testing do you include in your test plan to meet these requirements?

function NewFunc as integer

dim filenum as long
dim RecBuff as String

Filenum = freefile
NewFunc = false
OPEN InFile FOR Input As #filenum
while EOD(filenum) true
line input #filenum , Recbuff

if instr(ucase(RecBuff) ,(ucase(FindString)) then
NewFunc =true
exit while
end...

Suppose when you try to login to Unix server with your id and password, and find that it is not working. But you have access to root and login through it. Now how you will debug it?
Also for the same login failure how you will write test case? What priority and severity you will give?

What is the difficult situation you have faced when executing test cases?

1) Suppose YouTube does not play videos how to debug it.
2) Generate the test data for (start time, end time).
3) Write test cases for "Credit System Organization".

What is Cleanroom Testing?

Is performance testing is mentioned in test plan document?

What are the causes for delay in sprint release?

1) Major defects which faced in your career?
2) Give some Examples about the defects which you raised to developer, were those are accepted or rejected by developer?

What are the ways to test the cache when login the application.

Why Memory Leak Testing is important? How is it done?

Explain Selenium Framework architecture and folder structure.