This site writes yt-dlp commands. You choose what you want in plain language, it produces the exact command line, quoted correctly for the shell you are going to paste it into.
What it does not do
It does not download anything. No URL you type is sent anywhere, no file passes through a server, and there is no queue, no account and no rate limit — because there is nothing on the other end to queue for. The generator runs in your browser and on the page you are reading; the download happens on your own machine when you run the command.
That is a deliberate trade. A site that downloads for you is easier for a first-time visitor and worse in every other respect: slower, rate-limited, frequently blocked, and dependent on someone else keeping a server running.
Why the flags are shown
Every option displays the flag it produces, and the reference page documents all of them against a stated yt-dlp version. The aim is that you need this site less over time, not more.
Affiliation
None. yt-dlp is an independent open-source project; this is an unofficial helper built on top of its documented interface. Bugs in yt-dlp belong in its issue tracker, not here.