SEO is the active practice of optimizing a web site by improving internal and external aspects in order to increase the traffic the site receives from search engines. Firms that practice SEO can vary; some have a highly specialized focus, while others take a more broad and general approach. Optimizing a web site for search engines can require looking at many unique elements.

File Transfer Protocol (FTP) is a standard network protocol used to exchange and manipulate files over an Internet Protocol computer network, such as the Internet. FTP is built on a client-server architecture and utilizes separate control and data connections between the client and server applications. Client applications were originally interactive command-line tools with a standardized command syntax, but graphical user interfaces have been developed for all
desktop operating systems
in use today. 

Web Hosting service use the term bandwidth it is typical that they too mean traffic sent over their network, however the interval is over the course of one month. Your web host may offer 150GB of bandwidth for your hosting account - meaning that over one month or billing cycle, you can push 150 gigabytes of information over their network/through your web site and be within your accounts limits.