1. Photo (type = photo)
2. Directly Uploaded Photo (type = posted_photo)
3. Video (type = video)
4. Audio (type = audio)
5. Document (type = doc)
6. Graffiti (type = graffiti)
7. Link (type = link)
8. Note (type = note)
9. Application Content (type = app)
10. Poll (type = poll)
11. Wiki Page (type = page)
12. Photo Album (type=album)
13. Photos List (type=photos_list)
14. Market Item (type = market)
15. Market Collection (type = market_album)
16. Sticker (type = sticker)

Information about media attachments in posts is returned as attachments array with elements, each containing type field and an object with a field set defined by attachment type.

Schematic example for attachments object with two attachments:

[{"type": "photo", "photo": {photo}, {"type": "audio", "audio": {audio}]

Each object may contain additional access_key field — access key for an object. access_key description could be found at this page.

Object fields are described on the separated page.
post_id field with ID of the post returns for photos uploaded not to the requested post.

This is obsolete attachments type. It can be returned for posts created until 2013 only.

id integer	Photo ID.
owner_id integer	Photo owner ID.
photo_130 string	URL of the preview image with 130 px in width.
photo_604 string	URL of the preview image with 604 px in width.

Object fields are described on the separated page.

Object fields are described on the separated page.

Object fields are described on the separated page.

This is obsolete attachments type. It can be returned for posts created until 2013 only.
Graffiti returns as an object with type photo now.

id integer	Graffiti ID.
owner_id integer	Graffiti owner ID.
photo_130 string	URL of the preview image with 130 px in width.
photo_604 string	URL of the preview image with 604 px in width.

Object fields are described on the separated page.

Object fields are described on the separated page.

This is obsolete attachments type. It can be returned for posts created until 2013 only.

id integer	App ID.
owner_id integer	App owner ID.
photo_130 string	URL of the preview image with 130 px in width.
photo_604 string	URL of the preview image with 604 px in width.

Object fields are described on the separated page.

Object fields are described on the separated page.

id integer	Page ID
group_id integer	Community ID.
title string	Page title.

id integer	Album ID.
thumb object	Album cover, photo object.
owner_id integer	Album owner ID.
title string	Album title.
description string	Album description.
created integer	Creation date in Unixtime.
updated integer	Date of last update in Unixtime.
size integer	Photos count

Array of strings containing photos IDs.

Returns for versions 5.20 and later
Object fields are described on the separated page.

Returns for versions 5.52 and later
Object fields are described on the separated page.

Object fields are described on the separated page. This type returns for comments only.