spaCy Documentation for [ orth , pos , tag, lema and text ]

I am new to spaCy. I added this post for documentation and make it simple for new starters as me.

import spacy
nlp = spacy.load('en')
doc = nlp(u'KEEP CALM because TOGETHER We Rock !')
for word in doc:
    print(word.text, word.lemma, word.lemma_, word.tag, word.tag_, word.pos, word.pos_)
    print(word.orth_)

I am looking to understand what the meaning of orth, lemma, tag and pos ? This code print out the values also what the different between print(word) vs print(word.orth_)