An authority file is a kind of master list controlled vocabulary for specific persons, places, or things that is used to identify one specific person, place or thing and disambiguate it from others with the same or similar names. 

A controlled vocabulary is a fixed set of terms used to describe a given element of metadata such that each term indexes a particular concept. 

Descriptive metadata is information about the materials that can help users locate them and provide contextual details about their production, relationship to other objects, etc.

Embargo refers to a set number of years during which access to data files in a digital repository can be restricted.

Metadata elements are fields for specific types of metadata, such as author, title, date, location, etc.

A metadata schema is a standardized system of organizing metadata for cataloging purposes that uses a predetermined set of metadata elements and rules for organizing those elements. Many disciplines and national libraries utilize one or more metadata schemas; examples include Dublin Core Metadata Initiative (DCMI, or simply DC), Component MetaData Infrastructure (CMDI), and Metadata Object Description Schema (MODS).

Open access in a digital repository means that anyone can access, download, and reuse the data files. In digital language archives, this is also called public access.

Preservation metadata is information about the preservation status of a file which can be used for fixity checks to assure the information has not been corrupted or lost.

Rights metadata is information about an item’s copyright status, who holds its copyright, and what, if any, relevant licenses have been applied to it.

A rights statement is a statement about who owns the rights to archived data and specifies how that data may be shared and used.

Structural metadata is information about where a file is located in a sequence, hierarchy or file structure.

A tag is a term or keyword applied to an item, usually to make finding those items easier. Tags may be restricted to a controlled vocabulary, or may be open-ended, in which a user can type any term they wish.

Technical metadata is information about the form, size, and specifications of a digital file.