The suspended status for subscriptions is primarily used as a part of the dunning and failed payments flow.
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It mimics the cancelled status, so that whilst the subscription is suspended, the customer no longer has access to your companies product and the subscription will not renew.

The dunning and failed payments flow is customizable, so you're able to pick the status a subscription is set after the initial payment decline and subsequent re-attempts. For example, if a customer fails to pay the invoice for their subscription, you can choose to suspend their subscription until the unpaid invoice is reconciled.
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You can configure your dunning settings by navigating to Settings > Configuration > Dunning and failed payments.

Unlike a Paused subscription, a suspended one will not resume billing until the unpaid invoice is paid. The customer will have to pay the unpaid invoice to move the status of their subscription back to Active automatically through the dunning flow. If the invoice is left unpaid, or is written-off, the subscription status will not move to Active automatically.

You can manually update the status of your subscription from Suspended to Active, so that it will renew again, by navigating to the individual subscription and clicking the Update status button. Once the status of a subscription is changed to active, the subscription will resume billing immediately, according to the plan's cycle configuration.

You also have the option to manually update the subscription's status from Active to Suspended. This will stop the subscription from renewing until it is changed back to active.

You won't be able to manually update the status of a customer's subscription whilst they have any pending or unpaid invoices, so if there are any on the account then you'll need to write these off first.