column
A labeled slot in a table that holds one kind of detail, such as email or price.
Think of a spreadsheet that has a whole vertical strip for emails. In a database table, a column is that strip: one kind of detail, lined up across many rows. A row is one record, like one customer.
Columns matter because they decide what your app can remember and check. Each column has a type, such as text, number, date, or true/false, which tells the database how to store and compare that detail.
In Supabase you might add columns like email (text), created_at (date and time), and is_premium (true/false). Later your app reads and writes those columns when people sign up, pay, or change settings.