different between sdf vs dfd

sdf

sdf From the web:

• what sdf means
• what sdf file
• what sdf does
• what sdfd mean
• what sdfssvc.exe
• sdf what does it mean
• sdfsdf what does it mean
• sdfg what does that mean

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dfd

dfd From the web:

• what dfd notation is represented by the rectangle
• what dfd stands for
• what dfd notation is represented by the double lines
• what dfd notation is represented by two parallel lines
• what dfd notation is represented by the triangle
• what dfd notation is represented by the circle
• what dfd is normally leveled as