This new integration will allow Pinterest to be partnered with eCommerce site WooCommerce. This would give WooCommerce's 3.6 million merchants the ability to take their product catalogs and turn them into Shoppable Pins on Pinterest. 
WooCommerce is an eCommerce plug-in for Wordpress that lets the users of Wordpress add in a showcase of their products on their site. And now, they will be able to post the same items on Pinterest too, thus expanding the scope for exposure and sales.

This is what it means from Pinterest, though: "Our partnership with WooCommerce is part of our broader commitment to becoming the most inspiring shopping destination online. At Pinterest, we're building a home for taste-driven shopping, and investing in new ways for shoppers to browse, discover and engage with brands.". With the number of Pinners engaging with shopping surfaces growing more than 20 percent quarter over quarter and year over year in Q4 '21, this partnership gives Pinners more options to discover and purchase with confidence.
The integration will include a new Pinterest app within WooCommerce, that would be including a full range of shopping features from Pinterest, from tag deployment and catalog ingestion to ad campaigns creation and launch.

In addition to that, there would be beta access to the Pinterest API v5 given to WooCommerce merchants, which further opens opportunities for building more customized experiences for Pin shopping that can be accessed outside of the app.

This is the latest phase of the commerce feature rollout on Pinterest, which also included a similar integration with Shopify. That makes it easier for merchants to convert their product listings into Buyable Pins, so more products are available for display to users as it increases utility but also gives them more chances to have things exposed and drives more ad dollars from a much larger pool of merchants.

It's a smart move and far from being the last we'll witness since Pinterest moves closer to its goal of becoming the go-to place to discover and buy products online.