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I am trying to draw a footprint of some component which has 8 pins but in the document they shared for outline dimensions and footprint: Outline dimensions Footprint

There is some rectangle in the middle of the footprint. That has sx and sy dimensions. That part confused my mind. Is it silkscreen?

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    \$\begingroup\$ It's not silkscreen, it's probably a thermal pad. The datasheet of the part should have instructions as to how to connect it (usually GND or NC/float) \$\endgroup\$ – Wesley Lee Sep 11 '19 at 8:46
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enter image description here

It's a thermal pad to improve heat conductivity thus allowing the device to operate with higher electrical powers. Check the data sheet of the actual part.

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