An attribute type describes one kind of fact that can be recorded about a profile: for example "Birth date", "Height" or "Supports same-sex marriage". It has a title in English, Russian and Ukrainian, and it records which user created it.
Every attribute type has a value type, shown as "Value type" on its page. It fixes what an answer looks like: a number, an integer range, a percentage, text, yes or no, positive or negative, a date, coordinates, a location, a polygon, a real human, a group of people or a user profile.
An attribute is an attribute type applied to one profile, for example the birth date of one person. Each attribute is a question: users add values to it, each value backed by quotes from source documents, and each value gets a credibility level. The profile shows the most credible value.
An attribute type can be linked to a term, which defines what the attribute means. The page of an attribute type lists the attributes that use it across all profiles. Anyone signed in can create a new attribute type with "Create new attribute type" on the attribute types page.