ᴄᴏɴᴄᴇᴘᴛ ᴏғ ʟɪᴛᴇʀᴀᴄʏ & ᴄᴏɴsᴇǫᴜᴇɴᴄᴇs ᴏғ ɪᴛs ᴀʙsᴇɴᴄᴇ.