Cron
A system service executing commands according to a crontab schedule, for example backups. Time zones, permissions and overlapping runs need attention. Cron schedules execution; it does not guarantee the task succeeds.
Definition and sourcesKNOWLEDGE / FROM A TO Z
Glossary
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Cron job
A task executed on a schedule by cron. It needs a correct environment, permissions and error handling; scheduling does not guarantee success.
Definition and sourcesCrontab
A table or file of cron scheduling rules. It contains execution times and commands; field interpretation and timezone support depend on the implementation.
Definition and sourcesCross-browser compatibility
A website's ability to work correctly in agreed browsers. Pixel-identical appearance is not essential; accessible content and key functionality matter.
Definition and sourcesCross-selling
Offering products that complement a customer's existing choice. It differs from upselling, which usually suggests a more expensive or advanced version.
Definition and sourcesCross-site request forgery
An attack inducing an authenticated browser to perform an unwanted action. Defences include CSRF tokens, origin checks and appropriate cookie settings.
Definition and sourcesCross-site scripting
Injection of content executed in a browser within a trusted site's context. Defences need context-appropriate output encoding and safe untrusted-HTML handling.
Definition and sourcesCrypto wallet
A tool managing accounts, keys and transaction signing on a blockchain. Assets are recorded on the network, not literally inside a device. Custodial arrangements determine who controls the keys.
Definition and sourcesCryptocurrency
A digital asset using cryptography and system rules to transfer and control units. Designs vary. Cryptocurrencies are not automatically fully decentralised or immune to influence by individual organisations.
Definition and sourcesCSS (Cascading Style Sheets)
A stylesheet language describing document presentation, including colour, typography and layout. It works with HTML and differs from programming languages such as JavaScript. The cascade determines which declarations apply.
Definition and sourcesCSS framework
Rules, tools or components that help style interfaces, offering ready-made elements or utility classes. A CSS framework does not replace HTML or guarantee a correct layout without proper implementation.
Definition and sourcesCTA (Call to Action)
A prompt for a specific action, such as booking a call or downloading a guide. It can be a button, link or text. It should explain the next step and deliver what it promises.
Definition and sourcesCumulative Layout Shift
A visual-stability metric measuring unexpected layout shifts. Scores reflect shift size and distance; reserving image space helps reduce the problem.
Definition and sourcesCustomer acquisition cost
Customer acquisition cost divides defined acquisition spending by new customers. Comparisons need consistent time periods and cost coverage.
Definition and sourcesCustomer experience
The overall customer experience across interactions with a business, from initial information to post-purchase support. It is not limited to website appearance.
Definition and sourcesCustomer insight
An evidence-based conclusion explaining customer needs or behaviour. A single observation or guess is not yet a validated insight.
Definition and sourcesCustomer satisfaction score
A satisfaction measure based on survey answers after a defined experience. Results depend on question wording, scale and respondents, so context is essential.
Definition and sourcesDALL·E
An OpenAI model family developed to generate images from descriptions. It is not a generic name for every image generator. Check documentation for version availability; OpenAI's offering also includes GPT Image models.
Definition and sourcesDAO
An organisation using smart contracts and agreed voting mechanisms for governance. Decentralisation depends on voting distribution and permissions. Code does not eliminate human decisions, software risks or legal obligations.
Definition and sourcesdApps
Applications using decentralised infrastructure, often blockchain and smart contracts. Interfaces, hosting and other components may remain centralised. The dApp label does not guarantee security or complete decentralisation.
Definition and sourcesDarknet
An overlay network requiring special software or access configuration. It is not synonymous with all unindexed content and has both lawful and unlawful uses.
Definition and sourcesData lake
A repository storing varied data, often before final analytical modelling. It needs cataloguing and quality controls; collecting files alone does not create useful analytics.
Definition and sourcesData science
A field combining data analysis, statistics and programming to produce useful insights. It includes data preparation and evaluation, not just model training.
Definition and sourcesDatabase
An organised collection of data managed by a database system. Data models, queries and consistency rules affect application behaviour and future development.
Definition and sources