the diagram on this picture will probably help you see how the different connection types work
Unless you are using FTTP you will be going over some form of co-ax connection. As mentioned by others you need to look at both upload and download speeds you are being quoted. Upload speeds will affect things like backing up to cloud services (iCloud, oneDrive, Dropbox etc), uploading photos videos to facebook, youtube etc, if you are using smart home devices, CCTV - viewing your stream remotely.
Download is when you are pulling something from a remote server, such as viewing webpages, streaming films, streaming music etc.
There are many things that can and will affect speed you truly get, down to the time of day, the number of people, your position in the cab, contention at the isp, distance, the type and quality of the cables to your property.