What is the difference between .xls and .xlsx?

The .xls format is a binary file format used by Excel 97-2003, whereas .xlsx is an XML-based format introduced in Excel 2007. The .xlsx format allows for larger files and enhanced features like improved data recovery and better compression. For example, .xlsx files typically use less disk space.

To create a Pivot Table, first select your data range, then go to the 'Insert' tab and click on 'PivotTable.' Choose where to place the Pivot Table and click 'OK.' Drag fields into Rows, Columns, and Values areas to summarize your data effectively. For instance, you could summarize sales data by region.

VLOOKUP is used to search for a value in the first column of a table and return a value in the same row from another column. For example, if you have a table with employee IDs and names, you can use VLOOKUP to find an employee's name using their ID.

To protect a worksheet, go to the 'Review' tab and click on 'Protect Sheet.' You can set a password to restrict editing and choose which actions users can perform. For example, you might want to allow users to select cells but not edit them, ensuring data integrity.

The CONCATENATE function combines multiple text strings into one. For example, CONCATENATE('Hello', ' ', 'World') results in 'Hello World.' This is useful for creating full names from separate first and last names or merging data from multiple columns into a single column.

To sort data, select your range and go to the 'Data' tab. You can sort by one or multiple columns, either ascending or descending. For instance, sorting a list of products by price helps in quickly identifying the cheapest or most expensive items, streamlining decision-making.