The role of the lower house
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The lower house is typically the chamber elected directly from local districts, and in most parliamentary systems it is where government is formed. Whichever party or coalition can command a majority of its members generally gets to form the executive and set the legislative agenda for the term ahead of them.
Because its members represent defined electorates, the lower house is often seen as closest to the everyday concerns of voters, with representatives expected to raise local issues alongside national policy debates. Its size and composition can shift noticeably from one election to the next, sometimes quite dramatically depending on the national mood.
Most new legislation, particularly anything involving spending or taxation, must originate in or pass through the lower house before it can proceed further. That central role in both forming government and initiating law makes it the chamber most closely tied to election outcomes and to the shifting mood of voters more broadly across the country.