An email (short for "electronic mail") is a method of sending digital messages over the internet. It allows users to communicate quickly and conveniently by sending text, images, files, and other attachments electronically. Emails can be sent to multiple recipients at once and typically reach their destination in seconds.

Here are some key differences between emails and traditional letters:

1. Speed: Emails are delivered almost instantly, while traditional letters can take days or weeks to reach their destination.

2. Cost: Sending an email is usually free, while physical letters involve costs like postage.

3. Convenience: Emails can be sent anytime from anywhere with an internet connection, while letters require physical writing, addressing, and mailing.

4. Format: Emails allow for multimedia attachments, links, and text formatting, while letters are typically limited to text on paper.

5. Storage and Retrieval: Emails can be easily stored digitally and searched later, while physical letters need physical storage and are harder to organize.

6. Environmental Impact: Email reduces paper waste, as it doesn’t require physical materials like paper and envelopes.

Emails are generally faster, more convenient, and more flexible than traditional letters, making them a widely preferred choice for personal and professional communication today.