Required field in SQL is a column that must contain a value before a record can be saved.

• A required field is specified using the NOT NULL constraint in SQL.

• Example: CREATE TABLE Students (ID INT NOT NULL, Name VARCHAR(50) NOT NULL);

The resolution of a mobile screen refers to the number of pixels in each dimension that can be displayed.

• Resolution is typically expressed as width x height, such as 1920x1080 for Full HD.

• Common mobile screen resolutions include 720x1280 (HD), 1080x1920 (Full HD), and 1440x2560 (Quad HD).

• Higher resolution screens provide sharper images and text, but may consume more battery power.

An unclosed tag can cause rendering issues and break the structure of the webpage.

• An unclosed tag can lead to unexpected behavior in the layout of the webpage.

• It is important to always close HTML tags properly to ensure correct rendering.

• Example:

  Some content without closing tag

• Example:

Media query is a CSS technique used to apply different styles based on the characteristics of the device displaying the webpage.

• Media queries are used in responsive web design to make websites adapt to different screen sizes and devices.

• They are written using the @media rule in CSS.

• Media queries can target various aspects such as screen width, height, orientation, and resolution.

• Example: @media only screen and (max-width: 600px) { /* styles for screens up to 600px wide */ }

HTML is a markup language used for creating the structure of web pages.

• HTML stands for HyperText Markup Language

• It uses tags to define the structure of content on a web page

• Example:

  This is a heading