What is the Importance of Copper Thickness in PCB Design

What does PCB copper thickness Mean and why does it matter during the design process? Why are there different sizes such as 0.5oz, 1.0oz, and so on, what are their importance, and do they have a specific application use case? How do it after my design during and after the manufacturing process and is there a certain standard thickness used among designers? Your insight will be helpful to me. Thank You
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