@hj @karen there is a slight frequency difference, ADSL squeezes into whatever you can get over the plain phone cable and the distance, so relatively low freq and low speeds unless you're really close to the dslam (and dslam is well connected)
TV needs higher freqs into vhf/uhf range, it needs a proper coaxial cable, so a cable TV is much better off when they want to add internet
Coaxial cable is just a better cable, nothing else, it let's you do high frequency signal over longer distance (unless you get a fiber, ofc)