A graph that has its data represented in little symbolic pictures.
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There are two main disadvantages: 1. It is not always clear whether the relevant measure is the linear dimension of the pictograph, its area or the suggested volume. A typical example may be a sack of money. 2. People are not very good at judging proportions of partial pictographs.
Pictographs use pictures with a key to help you read it easily instead of reading a bunch of words and numbers.
they are both graphs.
simple graph is a graph without self loop and parallel edges