'Acquisition’ Vs ‘learning’

"Language acquisition does not require extensive use of conscious grammatical rules, and does not require tedious drill."

"Acquisition requires meaningful interaction in the target language - natural communication - in which speakers are concerned not with the form of their utterances but with the messages they are conveying and understanding."
"The best methods are therefore those that supply 'comprehensible input' in low anxiety situations, containing messages that students really want to hear. These methods do not force early production in the second language, but allow students to produce when they are 'ready', recognizing that improvement comes from supplying communicative and comprehensible input, and not from forcing and correcting production."
"In the real world, conversations with sympathetic native speakers who are willing to help the acquirer understand are very helpful." Professor Stephen Krashen (University of Southern California), leading linguist in USA

'Acquisition’ Vs ‘learning’    According to Krashen, 'acquisition' is the product of a subconscious process very similar to the process children undergo when they acquire their first language. 'Learning' is the product of formal instruction and it comprises a conscious process which results in conscious knowledge 'about' the language, for example knowledge of grammar rules. According to Krashen 'learning' is less important than 'acquisition'.  http://www.sk.com.br/sk-krash.html