This is the default view when people first arrive in the database activity. It shows multiple entries, usually stacked vertically one after the other. If there are a lot of entries in the database, and the entries are long, it may be worth making this a reduced view (with just a title and entry author) which can click through to the single entry.
Single entry view
This shows just a single database entry. It will contain all the information.
This determines what the page looks like when a student (or teacher) adds a new entry to the database. It will also contain all the possible fields for the participant to fill out, laid out in a way and order that makes sense.