What is the Difference Between 3G and Wifi (IEEE 802.11)?

3G and Wi-Fi (IEEE 802.11) are both wireless access technologies, but they serve different purposes and operate in different ways. Here are the main differences between the two:

Purpose: Wi-Fi is used for high-speed internet access, connecting nearby devices with each other and sharing the internet via hotspots. On the other hand, 3G technology is a set of standards for wireless mobile communication systems, primarily used for providing internet access to mobile devices.
Network Coverage: Wi-Fi operates in a short range, typically up to 250 meters, and is used for local area network (LAN) applications. In contrast, 3G has a wider coverage area, ranging from a few kilometers to several kilometers, and is used for wide area network (WAN) applications.
Speed: Wi-Fi can deliver speeds ranging from 11 Mbps to 55 Mbps, while 3G delivers speeds from 40 kbps to 70 kbps. Wi-Fi is generally faster than 3G.
Cost: Wi-Fi is less expensive to set up and maintain compared to 3G technology.
Setup: Wi-Fi requires a wireless router or access point, which connects to the internet service provider (ISP). 3G is provided by cellular service providers, not Wi-Fi routers.
Voice and Data: 3G supports both voice and data services, while Wi-Fi primarily supports data services.
Frequencies: Wi-Fi transmits data using 2.4 GHz and 5 GHz radio frequencies, which are more secure and have a longer range than 3G networks.

In summary, Wi-Fi is generally used for short-range data transmission and local networking, while 3G is used for wider coverage and internet access for mobile devices. Wi-Fi is faster and more cost-effective than 3G, but it has a shorter range and is primarily used for data services.