The differents tools used in Distance Education

Through several years technology has changed the types of tools used in distance education.firstly, the mail was a dominate delivery system for over forty years but then new technonogies started to provide more optios for this type of education like slides, television, radio and so on.little by little everything was changing, the methods, materials and technology tools and we can aware of it because today we have many differents ways to learn and teach making use of conferences,electronic mail, radio,chat, slides shows, power point, videos,printed material,computer systems, internet, blogs, etc. here is showed the differents tools used in distance education in the last years.