Fifo (first-in first-out) is like a super market line at the cash. The person who arrives first will be out first.
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in-> | | | | | | | | -> out
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Lifo (last-in last-out) is like the pile of dishes in a buffet restaurant. Fresh dishes are pushed into the stack. The last dish pushed in will be the first one to pop out when there is a customer needing a dish.
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|| | | | | | | | <- in || | | | | | | | | -> out
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