Within Planetfall a multitude of Factions exist. Characters are able to gain and lose Clout with these Factions by virtue of their actions. Generally, a successful Mission will result in directly gaining 3 Clout with the Faction that organised or requested the Mission, or 1 Clout that can be spent with any faction. Clout can also be won or lost with powerful individuals, but cashing this in requires a means of contacting them first.
Levelling up Clout with a Faction unlocks abilities to leverage your connections. Beware: you can lose Clout with a Faction if you displease them - particularly someone with a higher level of Clout than you. You can have negative Clout if you are particularly displeasing.
Anyone can give their Clout to another Character. Bear in mind that endorsing someone in this way inherently associates you with them and if they cause problems you could find yourself in a difficult position. You cannot trade Clout you don't have (i.e. you can't go negative from trading Clout).
Factions include, but are not limited to:
Someone in this Faction knows who you are and likes you enough to maybe swing a favour for you and give you the latest gossip.
You're a proven trustworthy ally to this Faction and can get a few people to help you out.
You are trusted by this Faction and can influence them to a lesser or greater degree depending on your choice of words.
Who says money can't buy you friends? Levels of Clout can represent having a certain degree of wealth in a particular planet or with a particular group (e.g. “Chips” for Ace's World, or “Tabs” on Mytene). Players that accumulate wealth will have it represented in the form of Clout with the location they have that wealth with.
Wealth may be spent or traded just as Clout is by giving it to other people. Ultimately, Clout is an abstraction to allow us to have multiple different cultures and economic systems working together in harmony - if in doubt, give some Clout.