2D art is art using only 2dimentional, flat. It only has a length and width.
Paintings are 2-dimensional, sculptures are 3-dimensional.
by two or more objects overlapping
Yes, value/shading makes 2-D art (drawings, paintings, etc.) look three-dimensional.
There is Paper or Card or some other art stuff you have in your home
Darrell D. Davisson has written: 'The advent of the Magi' -- subject(s): Art, Art, Gothic, Art, Italian, Christian art and symbolism, Gothic Art, Italian Art, Magi
Art that is flat or not 3-D
A sculpture in the round is a 3-D, or three dimensional, work of art. Other art works such as Installation Art are also 3-d, as are works like the pediment and frieze sculptures on the Parthenon.
D. T. Rice has written: 'Byzantine art' 'Islamic art'
The difference between heart clip art and other art forms is that clip art is usually 2-D and cartoon-like, while other art forms may attempt realism. You can learn more about art and the various forms at the Wikipedia.
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Helen D. Hume has written: 'The Art Teacher's Book of Lists' -- subject(s): Miscellanea, Art 'The Art Lover's Almanac'
John D. Graham has written: 'System and dialectics of art' -- subject(s): Art