Data compression and RLE

The purpose of data compression is to decrease file sizes .

• True
• False

Data compression is important for websites because:

• Your webpage will load faster
• Compressed images look better

Why do we compress data on computers?

• makes them smaller to make it easier to send over the internet
• makes them larger to make it easier to send over the internet
• makes them smaller to make it easier to send

When do we use lossless compression?

• When we want to keep ALL the original data
• When we want to keep SOME of the original data
• When we want to keep NONE of the original data
• When the file size stays the same

When is Run Length Encoding used?

• When we want to compress patterns of data
• When we want to decompress patterns of data
• When we want to encode running videos

What is Lossless Compression?

• No information is lost but file size is increased
• There is no loss of information at all after compression
• Files which have the exact same data after compression
• Compression involves an algorithm

What does Lossy Compression do to files?

• Increases the file size and keeps the same quality
• Eliminates no information at all
• Decreases the file size and keeps the same quality
• Eliminates unnecessary information in a file to reduce file size

Makes the file smaller by deleting parts of the file permanently (forever)

• Lossy Compression
• Lossless Compression

What do we call the smallest unit of data that can be represented in an image?

• Pixel
• Dot
• Colour
• Bit

The code for representing binary as letters and numbers is called

• SQL
• ASCII
• DECIMAL
• ALPHABET