What is the true definition of big data

How does the app above counts as a big data?

In an asymmetric encryption scheme the decryption key is kept private and never shared, so only the intended recipient has the ability to decrypt a message that has been encrypted with a public key.

Typically a virus installed on many computers (thousands) activate at the same time and flood a target with traffic to the point the server becomes overwhelmed.

a thief trying to trick you into sending them sensitive information. Typically these include emails about system updates asking you send your username and password, social security number or other things.

software that runs on servers (often routers) that only allows traffic through according to some set of security rules.

a mathematical operation that returns the remainder after integer division. Example: 7 MOD 4 = 3

used in public key encryption, it is scheme in which the key to encrypt data is different from the key to decrypt.