How Spanning Tree Protocol Provides Redundancy in path in L2 Layer?

Spanning Tree Protocol takes a graphs with cycles and reduces it to a minimal spanning tree, which you are correct that takes out redundant lines. However, if these lines were enabled the network would break and not run. Without STP a layer 2 802.1 network will forward the traffic blindly and you get a loop of infinite forwarding which in turn crashes the network.

With STP however you can have loops in your network but STP will disable them until the tree is rebuilt due to a change in the topology. What this means is if you have a network running spanning tree, and a few links go down you have other links that will come up thus you have redundancy and your network won't crash.

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