A few working definitions:
A Reader A very useful general term, frequently used to mean anyone who gives “readings”, without having to be specific as to the method used.
A Psychic We all have “psychic” ability. It is the natural sensitivity with which we understand the emotions of children, animals, and hopefully our nearest and dearest. Much of this is done through telepathy. An experienced Psychic is able to extend this to everyone he or she meets, but this does not necessarily mean that they are clairvoyant.
A Clairvoyant Literally “One who sees clearly”. This word has two meanings. Firstly, it can mean someone who can physically see the spirit world, just as a clairaudient is someone who hears it. These abilities are part of mediumship. For the purposes of this web site, we use the word to mean someone who sees clearly into the future.
A Seer/Seeress A slightly more mystical name for a clairvoyant
A Medium Mediumship is a very specific term. It describes the ability to act as a bridge between this world and the “other side”, and a true medium simply acts as a channel by which individuals who have died are able to give messages to people still on this physical plane.
Some readers operate just by sitting with you and telling you what they see and feel. This is very effective with pure mediumship, but for looking into the future most psychics will use one of the well known methods such as Tarot. However, each of these methods has it’s own strengths and weaknesses.
To confuse matters:
All mediums and clairvoyants are “psychic”. But not all “psychics” are either clairvoyant, or a medium.
Then not all clairvoyants are mediums. And of course not all mediums are clairvoyant.