Offshore software development involves hiring from distant countries to work remotely. Nearshore is similar to offshore, except companies hire from neighboring countries or countries with comparable time zones with few cultural differences. Onshore software development involves hiring workers from your own country.
Wi-Fi is just a name. Originally, Wi-Fi Alliance developed a technology based on IEEE 802.11 that we know today as Wi-Fi but needed a name that was more catchy than IEEE 802/11b Direct Sequence. The Wi-Fi Alliance hired a company, Interbrand, to come up with a name. They sent over 10 options, including Wi-Fi.