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 Description  
 Tangent:  When two figures are tangent, they share only one common point.

For example, a line can be tangent to a circle, a line can be tangent to a graph, and two circles can be tangent to each other.

Here is an example of a line tangent to a circle:

Here is an example of two circles that are externally tangent:

Here is an example of two circles that are internally tangent: