Opinion needed on FTP Vs SFTP

There are lots of questions related to FTP server. Firstly I want to know about the difference between FTP and SFTP? And why we are using Secure FTP instead of FTP? And why is SFTP better than FTP? I also want to know about the service providers of FTP. Can anyone help me? I shall be very thankful to you for your suggestion.

SFTP is encrypted so people can't steal your password and gain control of your files, or sniff out files you transfer that have sensitive information.

About Isp's , if you are short in cash, i would recommend bluehost/hostmonster.
And as FTP/SFTP client, Filezilla. It is free and good
https://filezilla-project.org/
If you aren't short in cash, dedicated server + system admin .....