Restore ABS Mesh Blocks data into postgres

Question

I've downloaded the ABS Mesh Blocks data set. and i want to restore it into postgres db using ogr2ogr.

inside the downloaded folder i've below files

MB_2021_AUST_GDA2020.dbf MB_2021_AUST_GDA2020.shx MB_2021_AUST_GDA2020.prj MB_2021_AUST_GDA2020.xml MB_2021_AUST_GDA2020.shp

i write a query to restore all these data to postgres like this below

ogr2ogr -f "PostgreSQL" \
    PG:"dbname=db1 user=postgres password=adminsadmins" \
    -nln ptv.mb2021 /home/inshaf/Desktop/Assignment/MB_2021_AUST_SHP_GDA2020/MB_2021_AUST_GDA2020.shp \
    -nlt PROMOTE_TO_MULTI \
    -s_srs EPSG:4283 -t_srs EPSG:7844

above query is successfully restoring the data

my question is don't i need to use other four files? then what is the use of other files?