FTP or File Transfer Protocol is the most common and simple way of transferring your files from your computer to your websites server. If you imagine transferring files from your computer to a memory stick, it is a very similar process. You would use this to actually upload files onto your website. Many people use this option to add or make any changes to their website. As an extra step of security, you will need to log in with an account to access your files, similar to that of login in to say, a Facebook account.
A more advance step you can take in file access is picking accounts that can only access certain folders those files are in. For example, lets say you are starting a new company and you’ve hired a photographer to take photos for you. You can grant that photographer to only have access to a certain folder while leaving the rest of your website secured and safe.
Ordinarily, you would access your files using FTP from an app. Some of the best apps for this are: