Custom CMS block displayed at the left sidebar on the Catalog Page. Put your own content here: text, html, images, media... whatever you like.
There are many similar sample content placeholders across the store. All editable from admin panel.
lookbook
Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque non nulla nulla, nec tincidunt risus morbi ultricies est ditae odio ultrices imperdiet. Cras accumsan dorci maces consequat blandi susto dusto elementum libero non honcus purus sem sit amet enimos.