The foundation
holds the house off the ground and distributes the weight of the
house and its contents over the soil. The introduction of an essay
basically does the same thing. It gathers ideas together to separate
them from the rest of the information in the world and it unites
those chosen ideas into a thesis statement. A separate unit from
the body of the essay, the introduction should grab the readers
attention through the attention getter and introduce the main
idea through the thesis statement.