Not the "regular" delegates who are chosen by the result of the vote, but people who have this status as a result of being members of the Democratic party who hold or have held either elective office or senior status within the party infrastructure.

When a delegate is selected, she is obligated to vote for her candidate during the first ballot at the national nominating convention. If a candidate leaves the race after receiving committed delegates, I think they become uncommitted and may vote as they wish in that first ballot.

Super-delegates are "uncommitted" delegates. A super-delegate is someone who was not selected by caucus/primary, but has voting rights in the nominating convention by virtue of his position within the party. I am not sure who, exactly, has super-delegate status, but I believe they include Congressional representatives, Congressional senators, state governors, national party officers and some state party officers. As uncommitted delegates, super-delegates may vote as they wish during the first ballot of the nominating convention.'

http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=132x4032732

I thought 'committed' delegates were UNPLEDGED super delegates who 'committed' to support a candidate...?

The wording can get curious! The role of the super delegates, in any event, is entirely separate from the role of the delegates who serve the will of the voters.

Super delegates include present and former nationally elected officials (senators, house members, e.g.) and party leadership members.

They comprise 747 of the 5,083 delegates attending the 2016 Democratic National Convention and can choose whichever candidate they want. They are also free to change their minds up to the moment they cast their vote. Hillary, as the establishment candidate, has somewhere around 500 of these folks "declared" or committed for her now. As a rule, the superdelegates vote with their state delegations, which reflect the will of primary or caucus voters in their states. I've been watching Democratic conventions since 1956 (okay, I was a very strange 11 year old), and that's the way it's worked since the invention of the superdelegates.

If there is at least a small probability that Hillary will win, a betting person should act as though she will win and should seek to curry favor with her. If Hillary does not actually win, such a person will have nothing to lose. But he/she stands to receive infinite gains if she does win.

COMMITTED DELEGATES are allocated based on the State's Primary/Caucus results, and are "committed" in the sense that they MUST vote the candidate they are committed two on the first ballot. After that, they MAY change their candidate choice.

UNCOMMITTED DELEGATES (generally Party and Elected OFFICIALS) are "uncommitted" in the sense that they may vote for whomever they want, and may change their mind at any time.

What most on DU call 'Superdelegates' are in fact called 'unpledged delegates'. Such un-pledged delegates can 'commit' to a candidate and be a committed vote from an un-pledged delegate but they can also switch and 'commit' to another.

Officially they are pledged and unpledged delegates. The committed or uncommitted aspect of the unpledged delegates does not alter the fact that they are unpledged delegates.

The verbiage used by the Party is 'pledged' and 'unpledged', not 'committed' or 'not committed' as those are separate issues. 'Superdelegate' is basically just slang for 'pledged delegate' be that pledged delegate committed or as yet uncommitted.

In Party language 'pledged' and 'committed' are not synonyms.