There are a few terms which are required to be known to comprehend what Wi-Fi technology is and what is the activity pattern of it. Following terms are pretty much involved with Wi-Fi and wireless networks.
Gigahertz
Gigahertz is the frequency measurement unit and it is represented as GHz. Frequencies are measured in the billions of cycles per second range. 1 Giga = 1 billion and heart is the unit for measuring different frequencies. GHz is used in Wi-Fi communication as computer performance measurement and radio frequencies. Central Processing Unit (CPU)'s clock speed is referred by GHz. IF GHz level increases it indicates the heightened performance of the computer. In Pentium 1 series the lowest clock GHz was 133 which had reached up to 4 GHz along the time. In radio communication this Wi-Fi term is refereed as bands of electric spectrum
Wibro
Wibro has no direct relation with Wi-Fi, but it is what can be called an extended version of Wi-Fi. This Wi-Fi term is a pet name for wireless broadband. Being developed in South Korea of now, it is the latest technology of wireless broadband, hence the newest Wi-Fi term. While Wi-Fi falls under IEEE 802.11 Wibro is under 802.16.  
Hotspot
Public places where Wi-Fi network is available for public use is termed as hotspot. Laptops, handsets, PDAs, Note books are wireless network cards ingrained at most. These are devised to connect to Wi-Fi network in the surrounding area. And the places which offer this Wi-Fi connectivity is available are marked as hotspots. Coffee shops, public libraries, public libraries, public grounds, airports and universities are such places.
Wi-Fi finder
This is a portable device to make wireless network available for public use in selected areas. It helps to find hotspot faster as well as the laptop battery does not get wasted finding the network around. Wi-Fi finders are mostly battery operated devices which are in size most alike a mouse. When Wi-Fi is turned on it starts searching wireless network around and if it is found its LED is turned on which sends a signal of availability. And in cases of unavailable network LED remains turned off. Wi-Fi finders operate on 802.11b/g bands. The market-price of Wi-Fi finders differ on the number of additional features. The expensive modules come with inbuilt antennas which enhance the connection capability and range. Wi-Fi finder modules can range from 150 feet to 300 feet. Once the network is detected the Wi-Fi finders can be connected to the laptop through USB.
Access point
Access Point is another important Wi-Fi term.  Access point is most alike hotspot. Its popular term is WAP (Wireless Access Point). Wireless connection devices are put together by WAP to form a wireless network. WAP networks are connected to network with wires.