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If you bought a camera about 10 years ago, you'd be swamped by the different types of memory cards that were available. I think there is about 50 different types of memory card.
SD (Secure Digital) cards have become the most popular, initially as SD card size for digital cameras, miniSD for mp3/mp4 players and then microSD (transflash) cards for mobile phones.
Since the SD standard had a maximum capacity of 2GB, which was fine 10 years ago when cameras had very few megapixels but as technology moves on, the SD card was replaced by the SDHC card, which has a maximum capacity of 32GB.
The latest generation SD card, the SDXC will start being introduced this year which will increase the maximum to 2TB (approximately 2000GB)
The class numbers are also important:
Class 2 has a minimum of 2MB/s transfer rate
Class 4 has a minimum of 4MB/s transfer rate
Class 6 has a minimum of 6MB/s transfer rate
Broadly speaking, the higher the class number, the faster the memory card is.
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