Budget controls how many times your ad can be shown and clicked each day. More budget means more clicks, and more clicks generally lead to more conversions, assuming the campaign is set up correctly. But if the conversion rate, meaning the percentage of people who click and then buy, is low, a bigger budget just means more wasted money. Budget and conversions are connected, but the quality of the campaign matters just as much as the amount you spend. Have you ever increased a budget and seen no improvement in conversions because of other issues in the campaign?