A "Democrat" is a member of the "Democratic Party" of the USA, it is not a political ideology in itself. Democrats are usually economic Liberals and don't care that much about workers or the environment, but some are Social Democrats (Bernie Sanders). They are also usually socially progressive.

The Republican Party is also composed mainly of economic liberals; however, they are typically socially conservative.

Democrat isn't really an ideology though as much as it's a coalition of voters. They can be anyone from Communists and socialists to conservatives who don't align with the Republican party. The majority of politicians within the party tend to be free market liberals akin to Clinton, with a few European style Social Democrats akin to Bernie Sanders and AOC. As someone who supports gun ownership and rejects the existence of corporate welfare and monopolies, I might not identify with many of the politicians within the Democratic party. Likewise I take issue with the Republican's stances towards human rights, the establishment of religion, and putting the legitimacy of elections into question. I might be more comfortable with voting Democrat, but the party's platform would not be how I would describe my ideology.