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It's a similar beast to Photoshop, offering a slightly pared down suite of photo-editing tools, but very likely all the ones you'll need.
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If you're working with photography alone, Lightroom may actually be all you need. I'd suggest checking out Adobe's Photography Plan, which gives you access to Photoshop CC, Lightroom CC and Lightroom Classic. There are quite a few options to choose from, starting with Single App plans that are pretty self-explanatory, as well as plans that provide you with a discipline-specific set of apps.
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If you want to download the full version of Photoshop from the get-go, you're going to need a Creative Cloud plan.
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