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what is a "tidy" dataset and what can make data "messy"?

what is a "tidy" dataset and what can make data "messy"?

Math   Statistics-And-Probability   
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Definition of Tidy Data:

Data arrangement is an important aspect of the statistical analysis of data. Tidy data is a way to structure the database to facilitate data analysis. In Tidy data, each column and each row is owned by each variable and each observation respectively. Secondly, a table is formed by every observational unit.

If all the conditions are met then a dataset is called the Tidy dataset.

If a Tidy dataset contains reductant columns, odd variable codes, and missing values then the dataset becomes Messy.

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