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The Stepping feature allows you to add and configure steps for numeric values. Steps means i.e. "ticks" or "stop points" where a specific value can be selected.
This is an important feature because attributes like e.g. price could have hundreds of different values in your product data feed. Normally you want to have a fix number of steps in a price slider or number picker widget and don't want to change it in an unintended way if the prices in the product data change.
To enter the stepping configuration dialog, just click on the Answer Option box of a Continuous Numeric Question (i.e. here the box showing "0, ...., 150 (€)":