Hello,
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Sequence and progressions are both a set of numbers arranged in a order either finite or infinite. But here the difference is sequences are arranged in a set of numbers and progressions tells us what kind of sequences are going on here, it means either increasing, decreasing or running in an order.
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Example for sequences are, 3,5,7,9,11......
Here there a particular rule for sequence to be followed
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Example for progression can be 2,4,6,8.....or 1,2,3,4,5....
Here progression tells us 2 and 1 the progressive rules to be followed,. which means for every 2 is getting added and for another 1 is getting added