system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is a tensor?

Is it something like a vector with more dimensions??? If possible, what’s a concrete example?
gpt
The word tensor is used in two ways.

One way is just the structure of fields of numbers:

Write the ages of everyone in your house in ascending order.  That’s a vector of scalars (a list of numbers). 

Collect the age vectors of every house on your street, in ascending house number order.  You now have a tensor, a list of lists.

A more strict way to use tensor is:

The life insurance premiums on your street will be determined by combining the “characteristic” age tensor and some other tensor that represents income or known health problems on your street. 

Here, tensor is a mathematical object that must have a certain “shape” or follow “rules” so it can be properly “combined” with other tensors.