The WhatsApp logo is a simple and recognizable symbol that consists of two parts: the wordmark and the icon.

The wordmark is written in a custom, sans-serif font with a rounded and friendly appearance. The letters are all in lowercase and are spaced closely together, which gives the impression of a unified and cohesive brand. The letters are colored in a light shade of green, which is associated with growth, harmony, and freshness.

The icon is a speech bubble, which is a common symbol for messaging apps. The speech bubble is stylized to appear as if it is coming out of the side of a phone or mobile device, with a phone receiver on the top right corner of the speech bubble. The speech bubble is also colored in the same light green as the wordmark, which helps to tie the two elements together and creates a consistent and recognizable brand identity.

Overall, the WhatsApp logo is simple, approachable, and playful, which reflects the app's emphasis on easy communication and social connections. The green color and speech bubble icon suggest a friendly and inviting environment, while the custom font adds a touch of personality and individuality to the brand. The logo's simplicity and clarity have helped make it one of the most recognizable logos in the world of mobile applications.