وَإِذَا قَرَأْتَ الْقُرْآنَ جَعَلْنَا بَيْنَكَ وَبَيْنَ الَّذِينَ لَا يُؤْمِنُونَ بِالْآخِرَةِ حِجَابًا مَّسْتُورًا 
Hajj means going to Mecca to perform tawaf (circumambulating the Ka'bah) and the rest of the rites during the months of hajj in response to the command of Allah and seeking His pleasure.