What is the difference between 2D and 3D with examples

Any figure that can be drawn by knowing two dimensions i.e. any two among lengthbreadth and height, then such type of figure is called a 2D figure. 2D figures are flat.
Example: rectangle, square, parallelogram quadrilateral, pentagon, triangle etc.
Any figure that can be drawn by knowing three dimensions i.e. lengthbreadth and height, then such type of figure is called a 3D figure. 3D shapes are solid.
Example: cuboid, cube, cone, cylinder, sphere etc.

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2D refers to objects or images that show only two dimensions; 3D refers to those that show three dimensions. Because reality exists in three physical dimensions, 2D objects do not exist. However, they can be portrayed in images and art.
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2d is flat and 3d is like real
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2D shows only two dimensions,3D shows only three dimensions 
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2d is 2 dimensinal eg a paper
1d is 1 dimentional eg thread
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Advantages Limitations 3DE provides realistic anatomic images in the beating heart which are easily recognizable and interpreted by the surgeon, interventional cardiologist, pediatric cardiologist, anatomist, etc 3DE data set acquisition and display require a specific training The additional dimension (depth) that is inherent to 3D acquisitions allows data set navigation and cropping to obtain "en face" views of cardiac structure of interest that were not available with tomographic imaging modalities (2D echo, cardiac magnetic resonance, computerized tomography) Patients with arrhythmias or unable/unwilling to cooperate for breath holding are challenging to image with current 3D technology 3DE allows visualization of cardiac structures independent on availability of specific acoustic windows (i.e. en face view of the mitral valve from apical approach) and anatomically sound alignment of the imaging plane to provide accurate planimetri of orifice size (i.e. planimetry of mitral stenosis or interatrial septal defect) Poor acoustic window limits the application of transthoracic 3DE In contrast with 2D echocardiography, re-aligning planes on 3D data sets to identify maximum longitudinal axis of cardiac chambers and avoid foreshortened views and optimize volumetric quantification is always possible Good image quality is a prerequisite for an accurate semi-automated or fully-automated volume quantitation 3DE provides a unique and reliable quantitation of right ventricular volume by echocardiography, both in healthy subjects and in patients Right ventricle has an unfavorable position within the chest for transthoracic 3D transducers and severely dilated right ventricles are often difficult to encompass in a pyramidal 3D data set 3DE measurements of cardiac chamber volumes do not rely on geometric assumptions about their shape, and are more reproducible and closer to values provided by cardiac magnetic resonance than 2D volumes Limited evidence exists about the reference values of cardiac chambers 3D volumes and the intervendor consistency of 3D quantitative parameters A comprehensive and time-volume analysis of cardiac chamber geometry and function can be obtained throughout the cardiac cycle from a single 3DE data set High temporal resolution can only be obtained from an ECG gated multibeat acquisition En face (surgical) views of cardiac structures allows a reliable identification of mechanisms and severity of organic as well as functional diseases of cardiac structures Technical conditions (image quality, temporal and spatial resolution, gain, compression, drop-outs artifacts, etc.) may significant impact on disease severity assessment  
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3d objects are 3 dimensional it is like real , like model whereas 2d objects are flat not like model
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good ans
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give me also votes
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2d is flat,3d is like a real
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