Selecting Table for the View format shows the results in a table with headers. Each field type becomes a column with each value being a cell for the given row. This format is only available for field displays of content. The headers can be made sortable, which allows a user to click on it to change the sorting of the table to that field and then control the direction. Tables from Views, like all tables in Drupal 8, are natively responsive. Selecting High for Responsive for a column ensures that the column is visible at all breakpoints described in the theme.
Selecting Medium means that they will be hidden at the mobile breakpoint and Low at the tablet breakpoint.

Table settings dialog