(In the Name of Allah, Most Gracious, Most Merciful, all praise and thanks are due to Allah, and peace and blessings be upon His Messenger)
As much as the Quran promotes justice, it also mentioned Charity as one of the most faithful acts that can be performed by a Muslim or anybody else. Consider the Following verse:
“It is not righteousness that ye turn your faces towards East or West; but it is righteousness―to believe in Allah and the Last Day and the Angels and the Book and the Messengers; to spend of your substance out of love for Him, for your kin, for orphans for the needy, for the wayfarer for those who ask and for the ransom of slaves; to be steadfast in prayer and practise regular charity; to fulfil the contracts which ye have made; and to be firm and patient in pain (or suffering) and adversity and throughout all periods of panic. Such are the people of truth the Allah-fearing.” (Surah Al-Baqara) (Quran Online)
The foremost charity that can be given is the Zakat which is also a pillar of Islam and apart from that, Quran mentions giving out a wave of monetary benefits to the people who are not that lucky in having a pleasant life or who are needy.
“O ye who believe! Cancel not your charity by reminders of your generosity or by injury― like those who spend their substance to be seen of men, but believe neither in Allah nor in the Last Day. They are in Parable like a hard, barren rock, on which is a little soil; on it falls heavy rain, which leaves it (just) a bare stone. They will be able to do nothing with aught they have earned. And Allah guideth not those who reject faith.” (Surah Al-Baqara) (Online Quran)
Charity removes the stains of evil as mentioned in the next Holy Quran verse:
“If ye disclose (acts of) charity even so it is well, but if ye conceal them, and make them reach those (really) in need that is best for you: it will remove from you some of your (stains of) evil. And Allah is well acquainted with what ye do.” (Surah Al-Baqara)
Giving out charity to people who need it is an act of belief and humility; it signifies that you consider helping other creatures and mankind, in fact all creatures of Allah and working as The Almighty instructed.