What is the structural difference between $HDP$ and $LDP$? How does the structure account for their different behavior,nature,and usage?

(N/A) $HDP$ (High Density Polyethylene) consists of linear molecules,which allow for close packing,resulting in high density and a translucent appearance.
$LDP$ (Low Density Polyethylene) has a highly branched structure,which prevents close packing,resulting in low density and a transparent appearance.
Due to these structural differences,$HDP$ is used for making buckets,dustbins,and pipes,while $LDP$ is used in the manufacture of squeeze bottles,toys,and flexible pipes.