nr konjeti, which operating system is your mac system? The Terminal comes with OS X in the folder Bear named above. If you're running OS 9 then you'd have to upgrade to OS X before looking for Terminal.
Hi narasimharao, please avoid phrases like "please reply immediately". It just ticks people off and won't get you an answer any sooner. If you are running Jaguar (OS X 10.2) then the Terminal app will be in the /Applications/Utilities folder as previously posted. If it is not there, then it has been deleted. In this case, you'll either need to obtain a copy from another Mac system, or repair your OS X installation. hth, bear
Are you running your Mac at home, or in an office? Was it configured by your IT department? It's not unusual for an IT department to create a "Master" image of a particular configuration of the OS and apply it to all workstations. It is highly likely they would also strip out any apps that would be a potential security issue, like the Terminal app.
If Terminal.app is missing, you could reinstall macOS, on top of your current installation. I mean even though you have macOS installed install it again over top of what you already have installed, without deleting or erasing anything. This should replace what comes with your version of macOS which is deleted.