LTE stands for Long Term Evolution and it is a type of wireless technology. Wireless technology is what makes it possible for phones and other devices to connect to the internet. LTE frequency bands are the different lengths of radio waves that are used to transmit data over the wireless connection. Different frequencies are used to get different speeds and qualities of connection. You can think of it like different types of roads - some roads are wide and open and allow for faster speeds, while other roads are narrow and have more stops and traffic, providing a slower and lower quality connection.