What is the thick lines indicate and thin lines indicate in below picture?

Question

Is that the trace width or something else? 
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shabaz · Accepted Answer

Hi Krishna.

They are most likely signal and power traces (the power traces being the thicker ones).

The specific part datasheet will indicate what those pads represent, but the thick traces look destined for the power plane(s).

shabaz · Answer

Hi Krishna,

In general but especially in this case you'd need to follow the datasheet, it's likely prescriptive in that area unless you wish to experiment and affect manufacturability/reliability etc (and probably you don't since these parts are expensive). And then in production it may need to be tweaked further, but the datasheet would be the starting point.

What is the thick lines indicate and thin lines indicate in below picture?

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