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A tablet was a portable computer with a touch screen used on 21st century Earth. According to the Curator, humans were the only species in the universe that thought they were a good idea. (PROSE: The Day of the Doctor)
Rosemary Kizlet used a tablet to control the minds of people in the Shard. (TV: The Bells of Saint John)
Later on in history, TG tablets replaced the 21st century variety, operating mostly on thought. (AUDIO: A Death in the Family)
Missy had a tablet with which she looked at Clara Oswald. (TV: Flatline)
iPad was a popular brand of tablet computers. (TV: Dark Water)
Danny Pink expressed surprise upon seeing a tablet in the "afterlife", to which Seb replied, "Well, we have Steve Jobs." (TV: Dark Water)