What is 1 pound in 1 US dollar?

Excuse me, could you possibly enlighten me on a matter of currency conversion? I'm curious to know what the equivalent value of 1 pound would be in terms of 1 US dollar. Is there a fixed exchange rate, or does it fluctuate based on market conditions? I'm hoping to gain a better understanding of the current economic landscape and how the values of different currencies interact. Thank you in advance for your time and assistance.