What employers mean by a placement year
A placement year goes by several names: industrial placement, year in industry, sandwich year or professional placement. They all describe the same arrangement. Between your second and final years, you spend roughly a year working full time for an employer as part of your degree, usually paid, and then return to university to finish. Some courses build the placement in from the start; on others you opt in by securing one.
For employers, a placement student is a short-term hire who does real work, and often a candidate they would like to see again on their graduate scheme. That shapes how they read your CV. They are not looking for a finished professional, but they do want to see that you understand the field, that your degree has given you relevant tools, and that you can handle a working week, deadlines and colleagues. They are also judging whether you have thought about why you want to spend a year with them in particular.
Your university's placements team is worth knowing early. They usually run CV clinics, keep a list of employers who have hosted students before and can tell you how your course handles the placement year: what counts, how it is assessed and what support you get while you are away.