what is difference between wi-fi (wireless)and blue tooth in laptop?

Answer 1

"Bluetooth vs. Wi-Fi in networking
Bluetooth and Wi-Fi both have their places in today’s offices, homes, and on the move: setting up networks, printing, or transferring presentations and files from PDAs to computers.

Bluetooth

Bluetooth is in a variety of new products such as phones, printers, modems, and headsets. Bluetooth is acceptable for situations when two or more devices are in close proximity with each other and don't require high bandwidth. Bluetooth is most commonly used with phones and hand-held computing devices, either using a Bluetooth headset or transferring files from phones/PDAs to computers.

Bluetooth also simplified the discovery and setup of services. Wi-Fi is more analogous to the traditional Ethernet network and requires configuration to set up shared resources, transmit files, set up audio links (e.g. headsets and hands-free devices), whereas Bluetooth devices advertise all services they actually provide; this makes the utility of the service that much more accessible, without the need to worry about network addresses, permissions and all the other considerations that go with typical networks.

Wi-Fi

Wi-Fi uses the same radio frequencies as Bluetooth, but with higher power consumption resulting in a stronger connection. As mentioned earlier, Wi-Fi is sometimes, but rarely, called "wireless Ethernet". Although this description is inaccurate, it provides an indication of Wi-Fi's relative strengths and weaknesses. Wi-Fi requires more setup but is better suited for operating full-scale networks as it enables a faster connection, better range from the base station, and better security than Bluetooth.

One method for comparing the efficiency of wireless transmission protocols such as Bluetooth and Wi-Fi is called spatial capacity."

Answer 2

WiFi is basically for your wireless network.

Bluetooth is basically for add-on things like remote controls, PDAs, printers, etc.

I've never found a good reason for Bluetooth in a computer.