The marketplace where publishers' ad spots are auctioned to DSPs in real time. Most SSPs run their own, so people often use the two words for the same thing.
What a publisher sells and you pay for: one price for one or more placements. Silver, Gold and Platinum packages are ad spots, and so is a podcast sponsorship with one placement.
Software you use to buy ads programmatically. One login gives you access to many exchanges, and it's the only part of programmatic a buyer signs in to.
The winner pays the price it bid. Nearly every exchange works this way now. It replaced second-price auctions, where the winner paid the runner-up's bid.
The least a publisher will accept for a campaign or an account. It can differ for each way to buy, so a console with no minimum can sit next to a $50,000 managed option.
One position where an ad runs, like a leaderboard, a newsletter position or a pre-roll. Publishers sell placements inside ad spots, and the price belongs to the ad spot.
Software buys and delivers the ad, usually through a DSP. It covers deals at an agreed price as well as auctions, so programmatic is not the same as auction.
A deal ID at a fixed rate for reserved impressions. You commit up front like a direct buy, but run it through your DSP. It's the guaranteed kind of private deal.
A company that sells a publisher's ad spots programmatically under its own accounts, like Freestar, Mediavine or Playwire. It's who you agree a deal with.
You open an account on the publisher's own demand-side platform, like Amazon DSP, and run your campaigns yourself. Its minimum spend is separate from the console's or a managed buy's.
The publisher's side of programmatic. It puts ad spots up for auction and takes bids from DSPs. You never log in to one, but you can switch it on inside your DSP.