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3D shapes are shapes that are represented in 3 dimensions rather than just flat. At this level they tend to be quite simple. Below is a chart of the most common ones you're likely to come across.
Name Properties Picture Rectangular Prism  A prism with rectangular bases.
 There are six faces.
 All faces meet at 90 degrees.
 Opposite faces are parallel.
Cube  A prism with six congruent faces.
 All faces meet at 90 degree angles.
 Opposite faces are parallel.
 It is a form of rectangular prism.
Triangular Prism  A prism with triangular bases.
 Only the bases are parallel.
Hexagonal Prism  A prism with hexagons for bases.
 Opposite faces are parallel.
Triangular Pyramid, aka Tetrahedron  A pyramid with a triangular base.
 A tetrahedron made up of four equilateral triangles is called a regular tetrahedron.
Square Pyramid  A pyramid with a square base.
Cylinder  A solid with two parallel circular bases.
 If you "unwrap" the middle section and lay it flat, it is a rectangle.
Cone  A solid with a circular base and a curved side that ends in one point
 It has one vertex.
Sphere  A solid figure where all points are an equal distance from the center point.
 It's a ball.
And here's an incribly cheesy video on the subject:

3 D shapes are shapes which are 3 dimentional in their look, that is when we look up on that figure it must provide a feeling of viewing a solid. And it must be represented using 3 axis, ie x,y and z.

3D Shapes are shapes that contain measurements in three different dimensions. Shapes drawn in twodimensions are "flat" and do not have depth. For example, a square is a 2D shape. In contrast, a cube is a 3D shape. There are different formulas used to find areas for 2D shapes and 3D shapes in Mathematics.
There are usually two different desired measurements of area for 3D shapes, as opposed to the basic area measurement of 2D shapes. Depending on your need, and using a Mathematical Formula, you may want to find the Surface Area of a shape (outside), or the Volume Mass of a shape (inside).
For example:
Cube Volume = Length x Width x Depth
Cube Surface Area = Length x Width x 4 (Sides)
Square Area = Length x Width

Lets take a simple example  a building. When you stand right in front of a building, you see only the front side which means 2 dimensions  the height of the builiding and its breadth. When you go around the building, you see another dimension (the third one) which the depth/width of the building.
In this case the depth is the distance between the front wall and the back wall of the building.

3D shapes means the 3 dimensinal shapes i.e. having length, depth and height eg. the room we sit in is 3 dimensional.

3D shapes are those that represents the shapes of the object in real world. The 3D means three dimensions namely the X,Y and Z axis.

3D Shapes are solids that can be represented using 3 axes X, Y and Z.
Examples: Cylinder, cube etc

3D shapes have faces and sides.

A 3D shape is a geometric figure that has three dimensions,width,depth and height

List of Geometrics Shapes  3D Shapes
Here are some common 3D shapes that you should know.
Along with a picture of each shape, the number of faces, edges and vertices are also given.
Common properties of the 3D shapes are also given.
Cube
Cubes have 6 faces, 12 edges and 8 vertices.
All sides on a cube are equal length.
All faces are square in shape.
A cube is a type of cuboid.
Cuboid
Cuboids have 6 faces, 12 edges and 8 vertices.
All the faces on a cuboid are rectangular.
Sphere
Spheres have 1 curved face, 0 edges and 0 vertices.
Cylinder
Closed Cylinders have 3 faces, 2 edges and 0 vertices.
Closed cylinders have 2 circular or elliptical faces and one curved rectangular face.
Cone
Cones have 2 faces, 1 edge and 1 apex (which is described by some mathematicians as a vertex).
Triangular Prism
Triangular Prisms have 5 faces, 9 edges, and 6 vertices.
The two faces at either end are triangles, and the rest of the faces are rectangular.
Hexagonal Prism
Hexagonal Prisms have 8 faces, 18 edges, and 12 vertices.
The two faces at either end are hexagons, and the rest of the faces are rectangular.
Triangularbased Pyramid
Triangularbased pyramids have 4 faces, 6 edges and 4 vertices.
The base is a triangle. All of the faces are triangular.
If the triangular faces making up the prism are all equilateral, then the shape is also called a Tetrahedron.
Squarebased Pyramid
Square based pyramids have 5 faces, 8 edges and 5 vertices
The base is a square. All the other faces are triangular.
Hexagonal Pyramid
Hexagonal pyramids have 7 faces, 12 edges, and 7 vertices.
The base is a hexagon. All of the other faces are triangular.
Suggested reading…
Draw plans and elevations of 3D shapes
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