The Skype logo with the white "S" letter on a blue background is an iconic symbol of the popular video and voice communication software developed by Microsoft. The logo consists of a stylized letter "S" in a white color, set against a bright blue background.

The white "S" in the Skype logo is a stylized representation of a speech bubble, representing the software's communication capabilities. The letter has a curved and friendly appearance, suggesting a welcoming and approachable communication experience.

The blue color used in the Skype logo is bright and vibrant, creating a sense of energy and excitement. The color is also commonly associated with trust and reliability, aligning with the brand's values of providing a trustworthy and reliable communication platform.

Another notable feature of the Skype logo is its simplicity and ease of recognition. The logo is designed to be easily identifiable and memorable, even at small sizes or from a distance.

The white "S" letter and blue background used in the Skype logo have remained consistent since the software's launch in 2003. Over time, the logo has undergone several design updates, but the basic elements of the white "S" and blue color scheme have remained consistent.

Overall, the Skype logo with the white "S" letter on a blue background is a recognizable and enduring symbol of modern communication technology. Its simplicity, vibrant color, and approachable design make it a highly effective and memorable symbol of the Skype brand.