In a large mixing bowl, combine the corn, tomatoes, sweet onion, jalapeño, and chopped cilantro.
Squeeze in the lime juice and season with a pinch of salt and a few grinds of black pepper.
Stir everything together thoroughly until the ingredients are well mixed and evenly coated in lime juice.
Serve immediately, or refrigerate for a short time to let the flavors meld before serving with chips, tacos, or grilled dishes.