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Times
x
*
y
*
z, x yz or x
y
z represents a product of terms.
The character is entered as  * or \[Times]. It is not the same as \[Cross].
Times has attributes Flat, Orderless and OneIdentity.
The default value for arguments of Times, as used in x_. patterns, is 1.
Times[
] is taken to be 1.
Times[
x
] is x.
0
x evaluates to 0, but 0.0
x is left unchanged.
Unlike other functions, Times applies built-in rules before user-defined ones. As a result, it is not possible to make definitions such as 2*2=5.
See the Mathematica book: Section 1.1.1.
See also: Divide, NonCommutativeMultiply, Dot.
Further Examples
This is a fast way to multiply the elements of a list.
In[1]:= 
Out[1]= 
This shows how a product is represented internally.
In[2]:= 
Out[2]//FullForm= 
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