Begin by washing the cucumbers. Slice them thinly, either into rounds or half-moons, and place in a large mixing bowl.
Add the halved cherry tomatoes, thinly sliced red onion, chopped cilantro, and chopped jalapeño (if using) to the bowl with cucumbers.
In a small bowl, whisk together the lime juice, olive oil, salt, and black pepper until well combined.
Pour the dressing over the salad ingredients in the mixing bowl. Toss everything together gently, ensuring the dressing coats the vegetables evenly.
Taste and adjust seasoning, adding more salt, pepper, or lime juice if desired.
Allow the salad to sit for about 10 minutes to let the flavors meld before serving, or serve immediately for a crisp texture.
For extra flavor, you can add some crumbled feta cheese or avocado to the salad.
Serve with tortilla chips for a delightful appetizer or alongside grilled meats for a complete meal.