Step 1: Understanding digital footprint.
A digital footprint is the record of everything we do online, such as websites visited, information provided, and transactions made. It includes both passive and active actions.
Step 2: Evaluating each option.
- Option 1: Digital footprint: This refers to the data trail left behind by our online activity, including visited websites, social media interactions, and online purchases.
- Option 2: Cyber crimes: Cyber crimes refer to illegal activities performed using computers or the internet, such as hacking, identity theft, and fraud. It is unrelated to the concept of a data trail.
- Option 3: Cyber bullying: Cyber bullying refers to harassment or bullying conducted online. It does not describe a data trail left behind.
- Option 4: Identity theft: Identity theft involves stealing someone’s personal information for malicious purposes, such as fraud or impersonation. It is not related to the data trail left online.
Step 3: Conclusion.
The correct term for the trail of data we leave behind while interacting online is a digital footprint.
Final Answer:
\[
\boxed{\text{The trail of data we leave behind when we visit a website or use an application is called the Digital Footprint.}}
\]