>>212842685 (OP)It literally just means longing.
Examples of the feeling would be:
"I miss home." (Homesickness > Longging of home > Saudade of home)
"I miss going out with my friends." (Desire to resume a relationship > longging of connection > saudade of friends)
If nostalgia is the apreciation of things past, saudade would be the desire to expirience them again. Usually this has a negativve conotation becuse you can never expirence a moment the exact same way, effectivly never fulfilling the original desire of reexpirence.