The amount of people who do not understand what "attachment" means to the Jedi is honestly a little frightening. Even though the explanation is just one Wookiepedia search away:
"Attachment was the inability to accept change as the fundamental characteristic of life; to accept death as the natural part of life; the inability to let go. Feeding into fear of loss and greed, leading to jealousy, attachment was selfish, a shadow of greed and thus a path of the dark side of the Force. Therefore, attachment was forbidden for a Jedi, who had to train themselves to let go of everything they were afraid to lose; to renounce all attachments. Thus, they could be compassionate and loving and caring, but not be possessive and grabbing and holding on to things, trying to keep them frozen in time, accepting the transitional nature of life. This allowed them to love the totality of life unconditionally."
