A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values.A cookie is created with thesetcookie()function.
For detailed information, you can walk through this video:
Here is the source code of Chat Application by another YouTube Creator.
Here is an explanation of the source code—https://youtu.be/XkV9XdHueL8
Computer is an electronic data processing device capable of taking an input data, processing them and displaying the processed result at a very high speed under the control of set of instructions. The four features of computer are :
The capabilities of computer are listed below :
The difference between GIGO and Bug are listed below:
|An error due to wrong instructions and data is known as Garbage in Garbage out (GIGO). ||An error due to a fault in a device or program is known as Bug. |
|It happens due to the error of the user. ||It happens due to the error of a device or program. |
The limitations of computers are listed below:
- Sinceit is a programmable electronic machine, it cannot work without the programs.
- It performs only those tasks which are instructed by the program.
- It cannot use its own logic and learn anything by performing the tasks.
The Abacus is the first calculating device developed by human beings which is made up of a wooden frame having two parts- upper deck and lower deck which contains 11 vertical rods with each rod consisting of movable beads.
Each rod contains two beads in the upper deck (also called Heaven) and five beads in the lower deck (also called Earth).
Any four reasons for using computers in education sector are listed below:
- To increase the access to education.
- To improve the quality of teaching and learning.
- To improve knowledge sharing.
- To increase the efficiency and effectiveness in admission and classrooms.
- To provide online courses for those who are looking to obtain degrees without quitting their jobs.
Any four reasons for using computers in the health sector are listed below:
- To keep the records of patients and medical information.
- To diagnose the diseases of the patients.
- To perform surgical operations.
- To monitor the condition of patients continuously.
- To research the cause of diseases.
- To research new medicines.
Any reasons for using computers in business are listed below:
- To send/receive emails.
- To provide efficient services to the customers.
- To maintain an account of business.
- To promote the business via social media marketing, email campaigns, etc.
- To do business remotely from all over the globe.
- To store data in an organizedway which allows for easy access and use.
- To keep the data and information securely.
- To make a paperless environment.
- To do sales analysis and financial forecasting.