Peanuts have wrinkled shells that are constricted between pairs of the one to four (usually two) seeds per pod. The mature seeds resemble other legume seeds such as beans, but they have paper-thin seed coats, rather than the usual, hard-legume seed coats. Evidence demonstrates that peanuts were domesticated in prehistoric times in Peru. Archeologists have (thus far) dated the oldest specimens to about 7600 years before the present. Cultivation spread as far as Mesoamerica where the Spanish conquistadors found the tlalcacahuatl (nahuatl = cacao, whence Mexican Spanish, cacahuate and French cacahu├Ęte) being offered for sale in the marketplace of Tenochtitlan (Mexico City). The plant was later spread worldwide by European traders. The legume gained Western popularity when it came to the United States from Africa. It had become popular in Africa after being brought there from Brazil by the Portuguese around 1800.

Peanuts, also known as groundnuts, are one of the most commonly consumed nuts in the world. Originally hailing from South America, peanuts have become a popular ingredient in a wide variety of dishes and products, from candy bars to peanut butter.

One of the reasons for the popularity of peanuts is their versatility. They can be eaten roasted, boiled, or fried, and are a staple ingredient in many Asian dishes. Roasted peanuts are often eaten as a snack, while boiled peanuts are popular in the southern United States, particularly in the summer months.

Peanut butter is perhaps the most famous use of peanuts, and is consumed in vast quantities in many countries around the world. It can be spread on toast, used as a filling for sandwiches, or incorporated into baked goods. Peanut butter is also a key ingredient in many savory dishes, such as satay sauce and African peanut stew.

While peanuts are most commonly used in cooking and baking, they also have a number of health benefits. They are an excellent source of protein, and contain a range of essential vitamins and minerals. In fact, studies have shown that incorporating peanuts into one's diet on a regular basis can have positive effects on cardiovascular health.

Despite their numerous benefits, however, peanuts can also be a source of danger for some people. Peanut allergies are a growing concern, particularly in children, and can range from mild symptoms such as hives or itching to life-threatening anaphylactic shock.

Due to the risk of allergies, peanut products are often labeled with warnings, and many schools and public places prohibit the consumption of peanut products altogether. In recent years, there has been increasing interest in developing hypoallergenic peanuts, which could potentially offer the health benefits of regular peanuts without the risk of allergic reactions.

Another issue associated with peanuts is their place in the global food system. As a crop that is highly susceptible to disease and pests, peanuts have historically been a challenge for small farmers. In addition, the concentration of peanut production in a few countries has led to concerns about sustainability and food security.

To address these issues, researchers and organizations are working to develop new varieties of peanuts that are more resilient and disease-resistant, as well as to promote more sustainable production and distribution methods.

Despite their challenges, peanuts continue to be an important part of the global food system and cultural landscape. From peanut festivals in the southern United States to the iconic peanut sculptures of the Mr. Peanut brand, peanuts have become an enduring symbol of both comfort and innovation. Whether roasted, boiled, or blended into butter, peanuts are a food that has captured the hearts and palates of people around the world.