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Welcome to TechCrunch’s 2021 Holiday Gift Guide! Need help with gift ideas? We’ve got lots of them. We’re just starting to roll out this year’s gift guides, so check back from now until the end of December for more! It is, somehow, that time again! Thanksgiving is hours away, which means it’s...

High-frequency traders have spent years building systems designed to work with the exchange’s data center.

Our tech gift guide will tell you the best phones and tablets to buy. But we can also recommend home-fitness systems, wrist cameras, follow-me robots and more, all tested by WSJ’s Personal Tech team.

From virtual-reality glasses to software to digital goods, the emerging online realms promise new ways to make big bucks.