What does S stand for in a automatic transmission gear?

My brother has a 2005 Honda civic hybrid automatic and it has
P
N
D
L
S
My question is what does S stand for and what does it do? And can I change it from D into S while am driving on the highway if not can I leave it on S while I drive on the highway for 70miles + ?

My car is making a strange sound, but only when it's in neutral. Just started last night?

Let me preface this with I have a very small knowledge of cars and how they work!
When my car is in neutral, it makes a rattling type sound, coming from somewhere under the hood I lifted the hood and it sounds like it's coming from the main engine area. Also, I was driving at a low speed, after I noticed the sound, and my car made a high pitched squealing noise that stopped after a couple seconds. Hasn't happened again. I don't remember if the car was in gear or not at that point.

I drive I 1996 Honda Civic LX! It eats a lot of oil, and has a couple sticky gears. Other than that I haven't experienced any issues with it in the two years I've owned it.
Please let me know if you have any idea what could be causing these strange sounds, so I can take the next steps to getting this issue taken care of!

Best Long lasting tires in USA?

I have an 2005 Honda civic hybrid and I have wanted to change the back tires for sure and maybe the front ones too and I was wondering what's the best tires that got good quality and last a long time I drive a lot so that's why I was wondering and what would be the best brand of tires and how much would it cost for each tire and can I find a tire less then $90 i commute a lot long distance drives need help picking thanks

Can data (pics, videos, etc) be transferred to a car? (Honda civic)?

I wanted to play some music from my iphone 6 in my friend's car ( honda civic) via bluetooth. It seemed that the connection was not successful bc my phone screen didn't show any devices to select from in order to make bluetooth connection. She suggested to use the cable and she pressed the "aux" button. The screen showed "loading" and then it changed to "no data". We on/off bluetooth again n still nothing worked, although she could connect her phone via bluetooth with no problem. I was able to connect my phone to 2014 Honda accord via cable before. I was wondering if any of my pics or videos or contacts has been transferred(somehow) to my friend's car or not?

2004 Honda Civic O2 sensor?

My CEL has ben on and I took it to two different mechanics who gave me no information so I bought my own code reader. There were two codes that came up: P0135 and P0134. I know that means it's a problem with my O2 sensor but what is wrong exactly? And does it need to be replaced?

Will this setup work for my 2007 civic?

Ok so my OEM passenger side speaker blew for my 2007 acura csx (Canadian car but its pretty much a 2007 honda civic) so I'm looking to replace my front speakers. My question is can I just buy speakers and use my factory wiring and everything else to plug n play.

These are the speakers I'm interested in buying
http://www.futureshop.ca/en-CA/product/jvc-jvc-6-1-2-2-way-car-speakers-cs-v628-cs-v628/10293953.aspx

I'm working with a budget right now, i don't know anything about tweeters etc etc. I'm aware that these speakers with tweeters though and I obviously want to be able to use it. When I talked to the installer at futureshop he quoted me about 150 for installation cause he mentioned something about a crossover? No idea what he meant but I thought it was pretty expensive. I'm not exactly too handy either when it comes to wiring but I do want to do the install myself to save some money but if it gets too complicated I'll have to suck it up and just pay for the labor. Any input would be good, thanks in advance.

Honda Civic Vti 2009 model making whistle sound?

I have Honda civic vti 2009 model and its 5 years old (79 KM running). After my 70K servicing it started making a whistle sound as soon as I start the car and sound increases as I push the gas paddle. Went to the same service centre where I had my car serviced and after 4 visits their answer is that they can't diagnose as this could be outcome of few different reasons. Spent $500 for last service and thats ended up living with this very annoying sound. Wondering if anyone else has the same issue or know anything about.

A very frustrated driver.