GoPro (GPRO) shares rallied as much as 70% on Wednesday morning as retail investors on online forums, including Reddit, lit up with enthusiasm for the struggling camera brand. Meme stock enthusiasts went after GPRO this morning as nearly 10% of its float was sold short heading into today.

Amidst tariff concerns and market volatility, there has been a rise in meme stocks, sparked by two stocks in the past week. A meme stock gains popularity and a high trading volume, driven by strong social media interest.

WallStreetBets, the infamous subreddit credited with helping to spawn the meme-stock phenomenon, is giving its regular readers a taste of what it was like during the trend’s heyday in early 2021.

By now most people, even those vaguely tuned into finances, have heard the phrase "meme stock." But if you're just catching up, here are some basics.