- - 3G
Third-generation mobile communication refers to the third generation of mobile communication technology, and is called 3G in English. The third-generation service enables the transmission of both voice and non-voice data (data download, mail exchange, message sending, etc. It is convenient when moving because the base station is dense by receiving data from a base station installed by mobile carriers.
https://ko.wikipedia.org/wiki/3%EC%84%B8%EB%8C%80_...
- - 4G
Fourth generation mobile communication (4G) refers to the fourth generation of wireless mobile communication standards following the 2G and 3G families. The 4G system is a comprehensive and stable all-IP-based solution with the ability to provide users with ultra-wideband (Gigabit speeds such as 100+ MiB/s) Internet access, IP phones, game services, and streaming multimedia.
Pre-4G technologies, such as early versions of Mobile WiMax and 3G Long Term Evolution (LTE), were commercialized in 2006 and 2009, respectively, and are often confused with 4G. Current versions of these technologies do not meet ITU-R's requirement for 4G that data transmission rates should be up to about 1 Gbit/s. Therefore, the technology commonly advertised as 4G LTE is about 3.9G. However, the ITU that defined 4G referred to LTE-Advanced, which improved LTE, and WiBro-Evolution, which improved WiBro, as candidates for the 4G selection at the beginning of the announcement, but in December 2010, the ITU also released a press release that LTE and HSPA+ could be called 4G. As a result, it has become impossible to strictly distinguish 4G technology, and as a marketing term, telecommunication companies in each country have individually called LTE 4G.
https://ko.wikipedia.org/wiki/4%EC%84%B8%EB%8C%80_...
It's technically complicated, but functionally, 4G is faster than 3G when you use the Internet.
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